The Clamwin free version doesn’t have a resident (on-access) scanner so shouldn’t be a problem even if it were installed, perhaps something that Tech is thinking about. I believe there are some forum members who use that as a back-up on-demand scanner.
Software I am installing requires to disable any antivirus. How can I disable & enable ClamWin?
You don't need to disable ClamWin Free Antivirus as it does not yet include on-access scanner. It won't conflict with the software you are trying to install.