Oops I only noticed your reply now. Sorry!
LUA is enabled in my pc already, and running the install as admin changes nothing.
I reinstalled windows 10 on my pc recently and for some reason, saithumbs hasn't worked since. I made sure I downloaded the right version and everything, but none of the SAI thumbs are loading at all. I noticed the message I get when clicking either install or uninstall changed, though. It's the exact same message for both and looks like this. I wondered if this is normal.