Final DOOM: Evilution - MAP31: How to fix the missing yellow keycard?

Final DOOM: Evilution - MAP31: How to fix the missing yellow keycard? - Yellow Jigsaw Puzzle Piece

I'm playing through Final DOOM: Evilution and I've run into a game breaking bug on MAP31: Pharaoh.

Apparently it was released with the yellow keycard missing from the single-player version. There used to be a 3rd party fix, but the developer's website no longer works.

How can I fix this without resorting to noclipping through the yellow gate?






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FINAL DOOM: The Missing Yellow Key




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ann H, Gustavo Fring, Francesco Ungaro, Ricardo Ortiz