I am a long time KSP player but haven't picked up the game in a few years. I got the itch to play the game a few days ago and walked into the whole unable to download issue. Thankfully this has been fixed but I am running into a new issue. When I downloaded the game and DLCs and tried to install them the DLCs are throwing errors about them being the wrong version number. Either they say that the game is an older version and thus incompatible or they say that themselves are in fact the older vers