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Cautiously optimistic that it may be working. Not entirely sure why, though.

Verified the Integrity and that seemed to result in it not even starting in steam, and still not working with just using the ck2.exe

So then I deleted local content through steam AND deleted the paradox folder in my docs.

When I then reinstalled it, it worked. Haven't tried putting my old save games back yet.
 
I don't even have a ck2.exe, all I have is a ck2game. And nothing works.
Does a reinstallation work?
And is that even possible with a steam copy or do I have to pay twice? This is the first game that required steam that I play.
 
I don't even have a ck2.exe, all I have is a ck2game. And nothing works.
Does a reinstallation work?
And is that even possible with a steam copy or do I have to pay twice? This is the first game that required steam that I play.

If you don't have a ck2.exe, something is wrong. To reinstall, just right click the game in the Steam library and choose to delete local content. Then right click again and install the game.