Hello.
Is there a way to downgrade project ? (For example project is done in 4.4 and I would like to have it in my 4.3 - which works better work me)
If you are using Windows, the .uproject file can be manually associated with any installed version of the engine. Just navigate to the project file in windows explorer, right-click the [projectname].uproject file, click “Switch Unreal Engine version…” in the context menu, set the desired version in the drop-down and click ‘OK’
NOTES: Things may go wrong, so you should make a backup copy of the entire project directory first! Also note that Blueprint-only projects typically convert without any major hickups when going from a lower version to a higher version, but I’m not sure what happens when you go the other way. Projects using C++ will probably need to be recompiled and possibly changed in case there are API differences.
This could solve my problem but since I was cleaning PC from not used things, I could remove it from my right-click. I remember that I had alot of things there so I decided to remove unnecessary things.
So what now ? 
Okay, somehow I figured out how to do it. Anyway it still says something like :
