Messed up GameData, Need a new KSP!

[The Moose In Your House]

When I was trying to install a few mods I accidently removed stuff from Gamedata, I tried to find the files and fix it but I can't seem to find them and it would've been easier to get a new KSP, the Gameplay and physics are also messed up. Help!    

Edited May 13, 2018 by The Moose In Your House

[Geonovast]

Back up your saves, uninstall KSP, reinstall the same way you installed the first time, then put your saves back.

Although if you didn't remove anything from the Squad folder (There's no reason to do so), you can just delete everything in GameData except the Squad folder and start over.