diff --git a/programming-old/android/samples/index-v1.0.30.md b/programming-old/android/samples/index-v1.0.30.md
index fcb8596..717c252 100644
--- a/programming-old/android/samples/index-v1.0.30.md
+++ b/programming-old/android/samples/index-v1.0.30.md
@@ -21,7 +21,7 @@ Before you start viewing the samples, the following concepts may help you unders
 
 ### License
 
-A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=android), it comes with a 30-day trial license by default.
+A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=android){:target="_blank"} link. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=android), it comes with a 30-day trial license by default.
 
 ### Video Document Normalizing
 
diff --git a/programming-old/android/user-guide-v1.0.0.md b/programming-old/android/user-guide-v1.0.0.md
index 02d3c2d..ad7b1bc 100644
--- a/programming-old/android/user-guide-v1.0.0.md
+++ b/programming-old/android/user-guide-v1.0.0.md
@@ -132,7 +132,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 #### Initialize Camera Module
 
diff --git a/programming-old/android/user-guide-v1.0.30.md b/programming-old/android/user-guide-v1.0.30.md
index 142abe4..d29459d 100644
--- a/programming-old/android/user-guide-v1.0.30.md
+++ b/programming-old/android/user-guide-v1.0.30.md
@@ -132,7 +132,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 #### Initialize Camera Module
 
diff --git a/programming-old/ios/samples/index-v1.0.30.md b/programming-old/ios/samples/index-v1.0.30.md
index ba9b97b..a2e390f 100644
--- a/programming-old/ios/samples/index-v1.0.30.md
+++ b/programming-old/ios/samples/index-v1.0.30.md
@@ -20,7 +20,7 @@ Before you start viewing the samples, the following concepts may help you unders
 
 ### License
 
-A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=ios), it comes with a 30-day trial license by default.
+A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=ios){:target="_blank"} link. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=ios), it comes with a 30-day trial license by default.
 
 ### Video Document Normalizing
 
diff --git a/programming-old/ios/user-guide-v1.0.30.md b/programming-old/ios/user-guide-v1.0.30.md
index 4efaa62..54db35a 100644
--- a/programming-old/ios/user-guide-v1.0.30.md
+++ b/programming-old/ios/user-guide-v1.0.30.md
@@ -153,7 +153,7 @@ Initialize the license first. It is suggested to initialize the license in `AppD
 >  
 >- Network connection is required for the license to work.
 >- The license string here will grant you a time-limited trial license.
->- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+>- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link
 
 #### Get Prepared with the Camera Module
 
diff --git a/programming/android/samples/index.md b/programming/android/samples/index.md
index fd025f7..e1bcbf2 100644
--- a/programming/android/samples/index.md
+++ b/programming/android/samples/index.md
@@ -20,7 +20,7 @@ Before you start viewing the samples, the following concepts may help you unders
 
 ### License
 
-A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=android), it comes with a 30-day trial license by default.
+A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=android){:target="_blank"} link. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=android), it comes with a 30-day trial license by default.
 
 ### Video Document Normalizing
 
diff --git a/programming/android/user-guide-v2.0.10.md b/programming/android/user-guide-v2.0.10.md
index 71072a1..72b2575 100644
--- a/programming/android/user-guide-v2.0.10.md
+++ b/programming/android/user-guide-v2.0.10.md
@@ -153,7 +153,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 ### MainActivity for Realtime Document Normalization
 
diff --git a/programming/android/user-guide-v2.0.20.md b/programming/android/user-guide-v2.0.20.md
index 9e5b668..48a0ff0 100644
--- a/programming/android/user-guide-v2.0.20.md
+++ b/programming/android/user-guide-v2.0.20.md
@@ -156,7 +156,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 ### MainActivity for Realtime Document Normalization
 
diff --git a/programming/android/user-guide-v2.2.10.md b/programming/android/user-guide-v2.2.10.md
index c4013de..c337c87 100644
--- a/programming/android/user-guide-v2.2.10.md
+++ b/programming/android/user-guide-v2.2.10.md
@@ -150,7 +150,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 ### MainActivity for Realtime Document Normalization
 
diff --git a/programming/android/user-guide.md b/programming/android/user-guide.md
index eacf516..4a36674 100644
--- a/programming/android/user-guide.md
+++ b/programming/android/user-guide.md
@@ -150,7 +150,7 @@ There are two ways to add the SDK into your project - **Manually** and **Maven**
    >  
    >- Network connection is required for the license to work.
    >- The license string here will grant you a time-limited trial license.
-   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+   >- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=android){:target="_blank"} link
 
 ### MainActivity for Realtime Document Normalization
 
diff --git a/programming/ios/samples/index.md b/programming/ios/samples/index.md
index 60e9a49..ff52ee3 100644
--- a/programming/ios/samples/index.md
+++ b/programming/ios/samples/index.md
@@ -20,7 +20,7 @@ Before you start viewing the samples, the following concepts may help you unders
 
 ### License
 
-A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=ios), it comes with a 30-day trial license by default.
+A network connection is required to verify the trial license in the samples. You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=docs&package=ios){:target="_blank"} link. If you download the [Installation Package](https://www.dynamsoft.com/document-normalizer/downloads/?product=ddn&utm_source=docs&package=ios), it comes with a 30-day trial license by default.
 
 ### Video Document Normalizing
 
diff --git a/programming/ios/user-guide-v2.0.10.md b/programming/ios/user-guide-v2.0.10.md
index 19894ac..99f41fb 100644
--- a/programming/ios/user-guide-v2.0.10.md
+++ b/programming/ios/user-guide-v2.0.10.md
@@ -150,7 +150,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, LicenseVerificationListen
 >  
 >- Network connection is required for the license to work.
 >- The license string here will grant you a time-limited trial license.
->- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+>- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link
 
  
 
diff --git a/programming/ios/user-guide-v2.0.20.md b/programming/ios/user-guide-v2.0.20.md
index dd17239..15a9497 100644
--- a/programming/ios/user-guide-v2.0.20.md
+++ b/programming/ios/user-guide-v2.0.20.md
@@ -153,7 +153,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, LicenseVerificationListen
 >  
 >- Network connection is required for the license to work.
 >- The license string here will grant you a time-limited trial license.
->- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+>- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link
 
 ### Main ViewController for Realtime Detection of Quads
 
diff --git a/programming/ios/user-guide-v2.2.10.md b/programming/ios/user-guide-v2.2.10.md
index 4876290..e71909c 100644
--- a/programming/ios/user-guide-v2.2.10.md
+++ b/programming/ios/user-guide-v2.2.10.md
@@ -169,7 +169,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, LicenseVerificationListen
 >  
 >- Network connection is required for the license to work.
 >- The license string here will grant you a time-limited trial license.
->- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+>- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link
 
  
 
diff --git a/programming/ios/user-guide.md b/programming/ios/user-guide.md
index ae0ed40..3ca4c0e 100644
--- a/programming/ios/user-guide.md
+++ b/programming/ios/user-guide.md
@@ -162,7 +162,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, LicenseVerificationListen
 >  
 >- Network connection is required for the license to work.
 >- The license string here will grant you a time-limited trial license.
->- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link. Offline trial license is also available by [contacting us](https://www.dynamsoft.com/contact/){:target="_blank"}.
+>- You can request a 30-day trial license via the [Request a Trial License](https://www.dynamsoft.com/customer/license/trialLicense?product=ddn&utm_source=guide&package=ios){:target="_blank"} link