Okay, so I'm running minecraft on my MacBook Air, and I have previously downloaded minecraft forge for 1.10.2 and 1.7.0, however, when I drag forge for 1.8.9 into the versions folder within the minecraft folder, and I go to the minecraft launcher, it isn't on the version list. I have done the exact same things as I have with the other forge version, so why is this one the only one which isn't working? And, most importantly, how can I fix it?
(I have re-downloaded forge for 1.8.9 multiple times trying to get it to work, I've restarted minecraft, restarted my computer, and I just don't see what I'm doing wrong)