Changing game version results in missing executable

[haydne]

every time I change game version via the betas tab it wont launch, it just says an error occurred while updating  (missing executable). KSP.exe is still in the files and I can launch it but its just not connected to steam. I've literally tried everything and nothing has worked. I've given up and as my last resort I've posted this. if anyone has any ideas it would be much appreciated.(btw the only version that works is the current version I'm just going back to try get north kerbin dynamics to work)

[jimmymcgoochie]

Modding the Steam copy of KSP is a bad idea; changing versions with mods installed is a really bad idea.

1.       Right click KSP in Steam library > browse local files.

2.       Copy KSP/saves/<your save name> and paste that on the desktop.

3.       If you used CKAN to install your mods (and you should!), click File > export modpack and save that to your desktop too. Screenshot your GameData folder with mods installed (even if you use CKAN) so you can check that you’ve reinstalled them all later.

4.       Uninstall all mods from KSP.

5.       Right click KSP in Steam library > properties, disable Steam cloud.

6.       Completely uninstall KSP through Steam.

7.       Reinstall KSP through Steam, right click > Properties > local files > verify integrity of game files. If you want to play a version other than the current release (1.12.3), pick that version in the Betas tab and verify the files once Steam has installed that version.

8.       Run KSP and make sure it loads properly without mods.

9.       Browse local files again, then go up one level (to Steam/steamapps/common) and copy the Kerbal Space Program directory, then paste it where you want to keep it- make sure it’s outside Steam’s folders so it can’t meddle with it in future.

10.   Rename the KSP folder so you know what mods you’re using in it (e.g. 1.10.1 RO/RP-1, 1.12.3 JNSQ), then add this new copy to CKAN and use the modpack created in step 3 to reinstall all your mods; or reinstall them by hand if you don’t use CKAN. Double-check that all files and folders you had in GameData before uninstalling/reinstalling everything are there again, if not then you’re probably missing some mods.

11.   Move your saves from your desktop into your new KSP copy’s saves folder, run KSP, load save. A warning about vessels having missing parts is usually because a mod is missing or wasn’t installed correctly.

[haydne]

with no mods it still wont launch (missing exe)

 

[Gargamel]

20 minutes ago, haydne said:

with no mods it still wont launch (missing exe)

 

Did you only disable mods or did you follow @jimmymcgoochie's steps listed above?

[haydne]

i took them all out of game data because i didnt have ckan at the time

[Gargamel]

7 minutes ago, haydne said:

i took them all out of game data because i didnt have ckan at the time

Follow the other steps listed above and report back.

[haydne]

yep did exactly as he said and still doesnt launch