Hello.
Not sure if you're still on the forums, but I was also having the PhysX problems. Through GOG forum about a different game, I found this link to download the PhysX (even though I have an AMD discreet graphics card). I installed it and my game opened, finally. Raze was also a big help.
Anyway, here's the link to download free PhysX, for anyone who might be having problems launching the game because of PhysX error.
https://www.nvidia.com/en-us/drivers/physx/physx-9-21-0713-driver/I hope this helps!
~~CierraShore
