To change the ASP.NET version in Plesk Control Panel, you can follow these steps:

Step 1: Log in to your Plesk Control Panel using your username and password.

Step 2: Once logged in, you'll see the Plesk Dashboard. Click on the "Websites & Domains" tab.

Step 3: In the "Websites & Domains" section, locate the domain for which you want to change the ASP.NET version and click on its name.

Step 4: On the domain's overview page, scroll down and click on the "Hosting Settings" option.

Step 5: In the Hosting Settings page, you'll see various settings related to your domain's hosting configuration.

Step 6: Locate the "Web scripting and statistics" section and find the "Microsoft ASP.NET support" option.

Step 7: Next to the "Microsoft ASP.NET support" option, you'll find a drop-down menu. Click on the drop-down menu to see the available ASP.NET versions.

Step 8: Select the desired ASP.NET version from the drop-down menu. You can choose from available versions like ASP.NET 2.0, 3.5, 4.x, or None (to disable ASP.NET support).

Step 9: Once you have selected the ASP.NET version, scroll down to the bottom of the page and click on the "OK" button to save the changes.

Step 10: Plesk will now apply the changes and update the ASP.NET version for your domain. You'll see a confirmation message once the changes are successfully applied.

That's it! You have successfully changed the ASP.NET version in Plesk Control Panel for the selected domain. Remember to test your website after changing the ASP.NET version to ensure it functions as expected with the updated version.