Install KSP mods properly.
The zip files posted to curseforge have always been for manual installation, and therefore no community standard exists for their directory structure. Auto-installation must follow suit in discovering the zip root's relationship with the target "Kerbal Space Program/GameData/" folder.
We will be working on this! If you have any other ideas or suggestions for this, please let us know and comment below!
Joshua Lloyd commented
This. Twitch should attempt to find a GameData directory. Failing this it should assume the contents are direct drop to GameData. The *.version file is quite popular it would seem though, perhaps a key could be provided for the root path.