A: This is because the cutscene video file is missing (common in compressed versions). Press Spacebar or Enter repeatedly to skip the missing video and start the mission.

The "UPD" variant often includes the silent patch or the v1.0 hard executable downgrader. This is crucial because it allows the game to support modern 16:9 widescreen resolutions and fixes mouse-freezing bugs common on Windows 10 and Windows 11.