Queen – “The Trap” [Campaign 1, Mission 4]

I'm also having a problem with completing this mission. When I encounter the "elves," a scripted cutscene plays, the game says "mission completed," I click OK, and then the game freezes (presumably loading the 5th mission) and crashes back to the mission selection screen for the first campaign, and only the first mission is available to select. ??? The game is a licensed version from 1C, version 1.0. Updating to version 1.4 didn't help. What should I do? Maybe someone can provide a save file for the beginning of the 5th mission of the first campaign?