Unity 2019.3.15 photon's truesync

Hi! I'm trying to find a deterministic physics system for a platform fighting game and trusync seems very promising! I managed to find an old photon/trusync library at https://github.com/Mukikaizoku/Photon-TrueSync-Experiments , but I need help trying to port it to the unity version that I'm using! My end goal is to write my own netcode so if anyone can help separating the PUN portion of the project from the trusync portion of the project, that would be greatly appreciated!

If all else fails, could anyone recommend some deterministic/fixed point physics system I could use instead?