Are you doing something to the files before opening the game, such as removing a ".dll" or an image?
Either that, or your computer doesn't accept certain file types, in which case, try downloading it again, delete every download you have (which will unfortunately also take away any saves you might have had) then redownload yet again
I'm not doing anything, no (well, I'm adding the saves folder, but that gets created on startup anyway and has nothing to do with this as 1. it started not working before there even was a saves folder and 2. it works sometimes even if I do this or not). I re-downloaded several times and suddenly it just worked. Then the game crashed and didnt start again, so I had to re-download 6 more times until it finally worked. I have NEVER seen this before. I think there is an issue with how the files are compressed or something which causes both 7zip and windows to screw up the unpacking process. Still no idea why.
Do you keep the ones that don't work or do you delete those folders? If you keep them, that's the problem. Windows unzips the files into the already unzipped folder with the same name, which basically gives you the same encounter every time, except when the game works for that small amount of time. If you delete the old folders every time, I don't know what's happening, as 7zip works just fine to unzip for m
