I was trying too start using the upgrader/downgrader the other day and I noticed that it didn't work if the script was in a sub-directory with spaces (for example the GTAV directory). Added some quotes that alleviate that problem. Tried to contact illuminati on discord, but I couldn't find him so here is a gist of the updated version!

https://gist.github.com/jwolff52/66ce803b4a784a6be520e16a99ef40c0