VaM (or VaMX) can be deleted simply by deleting the VaM folder you downloaded it into. It does not install or modify anything outside of it's own folder. So just delete that, and then purchase this from itch.io and you should be good to go! It's a simple, single installer. VaMX requires a lot of resources, but your 4080 RTX should be just fine. At least 16 GB of RAM is required.