Found source of problem.
Some GUIs have buttons inside: for example gIconbar has btnIconWalk. This button has own setting\properties and script name (btnIconWalk).
When importing, which I described above (with deleting of "compressed" old GUIs), for some reason, I have these names with "2" in the end (btnIconWalk2). So game was crashing on launch, because I didn't see that new "2" in names.
I just deleted this number, saved project and everything work fine now.