Just back to SC myself after playing a "few" other games the past year and a bit.
Reinstalled SC, patched to 108 and then added SCXII.
Try the first mission with that combination!
As the scenario opens you are "cavitating" and within 20-seconds the tanker is sunk - game over!
I have no idea how to get past it...foolishly I've opened that mission 3 times to the same result?!?