Realy ♥♥♥♥ing weird problem

[holland883]

When go to my games it says crusader kings needs to be installed but it is already installed and has been for the last 6 months and yesterday i could still play it, and i can still play it without steam if i open the game from the folder. I have it installed on my D drive and the other steamgames that are installed on the D drive still work. Is it posible to get it back on steam without re-installing it?

[sounds like a wooosh]

What's wrong about just installing it as the client suggests?

[sounds like a wooosh]

P.S.
If you did not go into your Steam client for 6 months you might have missed the last updates in CK2. If it is so, it simply wants to provide you automatically with the current version of the game. – This option is able to be turned off in the client for all games – and also for each one individually with the right mouse button.

[holland883]

I have been playing it a lot since i got it (it is up to date), i could play it yesterday and when my pc was on for a day by accident it just freaked out. I do not want to install it again because my internet sucks and it would take about a day and i still have the game on my PC.

[sounds like a wooosh]

I see.
Well, for me it looks like some checksums failed. If you still can play without Steam, do that probably - and/or reinstall over night then…

I also think that Steam normally only updates missing parts. So there is a chance that it does not have to download everything.

If you expect such troubles again, or are experimenting – try using backups maybe. I did some – because I do not have much space left on my main HD and backups from my external HD prevent the re-downloading if I needed quickly more space and had to delete the local data.
Good luck!