Learndash Course Lock by serial v1.0.0

1. Upload the learndash-content-locker.zip file and activate the plugin.

2. Edit the learndash course setting to closed and add the slug page /enter-serial-code/ or whatever you changed the serial page slug to in the button field.
   

3. Create a new serial and choose which course the serial will be related to.

4. You can either edit the title or change the validity for the serial.

5. Once a user enters a valid serial, he will be redirected to the course page and gain the access to the course.