You can choose the required ASP.NET version from Plesk according to your need. For that you can follow below steps:
- Login to Plesk.
- Click on “Websites & Domains” and then click on “Hosting Settings” option.
- You have to check the checkbox “Microsoft ASP.NET support (version)". Choose the required ASP.NET version and then click on “Ok”. You can select ASP.NET version like 3.5, 4.0 and 4.5.