This is the 3rd crypt key I found as there were no videos showing this solution. I hope this helps if you never got the upstairs crypt key. I know there are a ton of puzzles in this game which can be frustrating. You basically make an "L" shape to your left is the easiest way to describe it. but once you see the solution its pretty easy!
Please like my videos, and any requests for videos will be considered. Don't ever give up! Keep on fighting!