Today I made some experiments
Install.bat works. It completely removes old "launcher" folder but it can't move new "launcher" folder to the Renegade X directory. And at the end of installation process I always have error message (can't find Launcher.exe).
So I found "RxTmp" folder where installation files lie and moved new "launcher" folder manually.
Problem solved, but I still don't know what's wrong with my pc