Minaralwater

Had the same problem. Turns out in the zip file it starts with GameData because its supposed to be extracted into the main install folder. I first put it into the GameData folder and ended up having a directory like "...\Kerbal Space Program\GameData\GameData\Galen\..." and after putting the Galen folder into the actual GameData folder so it's just "...\Kerbal Space Program\GameData\Galen\..." it fixed the issue for me. Hope this helps since the IVA's are really good ones.