First, log in to Plesk as ‘useradmin‘, click on the ‘Domains’ icon, and then select the domain you wish to install Classic ASP for.
Next, click on ‘Web Hosting Settings‘. Then, scroll down, and place a check mark next to ‘Microsoft ASP support‘, and click ‘OK‘ at the bottom of the page.
Once receiving the confirmation that the command completed, you should now be able to use Classic ASP under the domain with no issue.
If you need any assistance with this process, or encounter any issues, please don’t hesitate to contact our Technical Support Department.