Hi all,

I have a solution for the 'Installed game version is invalid or incomplete' patcher bug, where it also occurs alongside the game launcher itself being unable to start the game (it just leaves the wolfshead medallion on your desktop, but the game never loads).

In my case, the problem was caused by an antivirus product known as 'Immunet' silently quarantining witcher2.exe. This quite literally meant the game was incomplete! The patcher then detects this and fails with the 'Installed game version is invalid or incomplete' message (CD Projekt - how about actually telling us what is missing?). The game itself also can't launch because witcher2.exe is not available, but it never properly errors on that, just hangs forever (fix this too CD Projekt! A meaningful error would have been very useful and saved me a lot of mucking about! Seriously, I'm a coder myself and this is basic programming practice!).

If you have Immunet, this is likely your issue. If you don't then it may still be a similar issue - check your antivir isn't quarantining something is shouldn't. Also - go and look to see if 'witcher2.exe' is present in your install. It lives in the \bin folder. If it is missing, try to find out why.

I have also contacted Immunet about this, so maybe they will fix it for that product. Or not.

Good luck folks,

--Cam