Everything you need for original Quake is already in the download above.
The list you copy/pasted from the opening post mentiones the official mission pack bugs. You do not need them for regular Quake.
If you want the mission pack bugfixes as well, you can download their corresponding SMC packs from first page of this thread. They are all included and the source is always included as well.
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Dear all,
Some time ago a forum user mentioned the issue in Quake that monsters can protrude into walls. Which looks weird. Especially when their corpses are half way sticking in walls...
I added a collision check algorithm around the monsters to avoid the described behaviour. It works robust and does not interfere with maps and monster pathfinding because their bbox will stay exactly the same.
It works with all engines and all monsters in all maps.
Here is a clip that shows the improved behaviour in-game:
Please click the "enable subtitle" button to read the included text.

Best regards,
Seven
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