Thanks, I've tried it. It's OK, but definitely not the one I had before. I must have been crazy to lose that.
The version you have linked to seems easier in some ways (the enemies in the Study and the Forgotten Abbey all move in sync, the bouncing ball in Downstairs has been removed), but the enemy sprite patterns are different. Anyone who was a pro at the original would have to get the new patterns down.
Eh, might be worth a try. But if anyone has info on that mystery version that only I seem to have played, let me know! Remember: there was a room editor (maybe as a separate exe).