I would like to remap keyboard controls but I don't know how. I am able to enter options, but when I hit konfigure control an inscription on red background "use options many" appear. Where's that?

Also how to exit the game, right now I am using task manager... ?

I don't have the GOG release, but Alt+enter switches to Windowed mode.

When windowed you can hit esc to exit or click Options on the toolbar to find keyboard setup.

If this doesn't work in the GOG release I'd say grab the Kommunity Patch. As that can use the files from a GOG install, you would presumably get those options once it's done its work.

Thanks, GOG version definitely does not support windowed play. I have located community patch site but the download demands personal data entered like a phone number so I think I'll postpone play as I don't feel comfortable leaving such data on xy webpages.

I have to disagree. I have GOG release and you just need to press ESC on your keyboard. This should switch you between windows/fullscreen modes.