Honestly, probably open up codex/Claude/pi in the folder and ask it where to start. Modern LLMs are crazy good.

For example I had a VR setup of GTA5 with adaptive triggers during covid but it eventually degraded due to updates and compatibility issues. Quite literally today I opened codex and had it up and running with custom patches for some bugs I used to deal with in a few hours.

I would start by asking it how to start and then digging away.