How to change ASP.NET version in Plesk Control Panel 12.5?
To change ASP.NET version of your sub- domain proceed with the steps given below.
Step 1: Login to Plesk panel.
Step 2: Under Websites & Domains, click Show more near the respective subdomain.
Step 3: Select ASP.NET Settings.
Step 4: In the resulting page, select Change Version.
Step 5: Select the required version and click OK.You will get the confirmation message once if ASP.NET version was changed.