Yeah, I tried opening the file with 7zip, but it didn't work. I know it's supposed to be a zip file renamed, but something was wrong. I've redownloaded, too. I also did put it into the correct folder. Other mods I have in there work fine.
...but then I redownloaded again today, and it seems to be working. ?
This person is having the same issue, so at least I know it's not just me. I guess something goes wrong with MediaFire sometimes.