diff --git a/HIBPOfflineCheck.csproj b/HIBPOfflineCheck.csproj
index 1db627c..9e96181 100644
--- a/HIBPOfflineCheck.csproj
+++ b/HIBPOfflineCheck.csproj
@@ -31,6 +31,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
+    <LangVersion>5</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="KeePass">
diff --git a/HIBPOfflineCheckOptions.cs b/HIBPOfflineCheckOptions.cs
index 5a008eb..bc74c77 100644
--- a/HIBPOfflineCheckOptions.cs
+++ b/HIBPOfflineCheckOptions.cs
@@ -3,7 +3,6 @@
 using KeePassLib;
 using System;
 using System.Windows.Forms;
-using static HIBPOfflineCheck.Options;
 
 namespace HIBPOfflineCheck
 {
@@ -28,8 +27,8 @@ private void HIBPOfflineCheckOptions_Load(object sender, EventArgs e)
 
             options = ext.LoadOptions();
 
-            radioButtonOffline.Checked = (options.CheckMode == CheckModeType.Offline);
-            radioButtonOnline.Checked = (options.CheckMode == CheckModeType.Online);
+            radioButtonOffline.Checked = (options.CheckMode == Options.CheckModeType.Offline);
+            radioButtonOnline.Checked = (options.CheckMode == Options.CheckModeType.Online);
             textBoxFileName.Text = options.HIBPFileName;
             textBoxColumnName.Text = options.ColumnName;
             textBoxSecureText.Text = options.SecureText;
@@ -46,7 +45,7 @@ private void HIBPOfflineCheckOptions_Load(object sender, EventArgs e)
 
         private void buttonOK_Click(object sender, EventArgs e)
         {
-            options.CheckMode = radioButtonOffline.Checked ? CheckModeType.Offline : CheckModeType.Online;
+            options.CheckMode = radioButtonOffline.Checked ? Options.CheckModeType.Offline : Options.CheckModeType.Online;
             options.HIBPFileName = textBoxFileName.Text;
             options.ColumnName = textBoxColumnName.Text;
             options.SecureText = textBoxSecureText.Text;
diff --git a/HIBPOfflineColumnProv.cs b/HIBPOfflineColumnProv.cs
index a71e7b7..86ed3a0 100644
--- a/HIBPOfflineColumnProv.cs
+++ b/HIBPOfflineColumnProv.cs
@@ -31,7 +31,10 @@ public HIBPOfflineColumnProv()
             HIBPOfflineCheckExt.Host.MainWindow.EntryContextMenu.Opening += ContextMenuStrip_Opening;
         }
 
-        public override string[] ColumnNames => new [] { PluginOptions.ColumnName };
+        public override string[] ColumnNames
+        {
+            get { return new string[] { PluginOptions.ColumnName }; }
+        }
 
         public override bool SupportsCellAction(string strColumnName)
         {
diff --git a/Util/build_plgx.bat b/Util/build_plgx.bat
index 974c82b..e840641 100644
--- a/Util/build_plgx.bat
+++ b/Util/build_plgx.bat
@@ -9,12 +9,16 @@ xcopy /Y %PluginRoot%\HIBPOfflineCheckExt.cs plgx\
 xcopy /Y %PluginRoot%\HIBPOfflineCheckOptions.cs plgx\
 xcopy /Y %PluginRoot%\HIBPOfflineCheckOptions.Designer.cs plgx\
 xcopy /Y %PluginRoot%\HIBPOfflineCheckOptions.resx plgx\
+xcopy /Y %PluginRoot%\HIBPOfflineColumnProv.cs plgx\
+xcopy /Y %PluginRoot%\ProgressDisplay.cs plgx\
+xcopy /Y %PluginRoot%\ProgressDisplay.Designer.cs plgx\
+xcopy /Y %PluginRoot%\ProgressDisplay.resx plgx\
 xcopy /Y %PluginRoot%\Options.cs plgx\
 xcopy /Y %PluginRoot%\Resources\Nuvola\B48x48_KOrganizer.png plgx\Resources\Nuvola\
 xcopy /Y %PluginRoot%\Properties\Resources.Designer.cs plgx\Properties\
 xcopy /Y %PluginRoot%\Properties\Resources.resx plgx\Properties\
 
-%KeePassExe% --plgx-create "%BuildPath%plgx"
+%KeePassExe% --plgx-create "%BuildPath%plgx" --plgx-prereq-net:4.5
 
 move /Y "%BuildPath%plgx.plgx" %PluginRoot%\HIBPOfflineCheck.plgx