PhysX.dll file missing, manual installation still doesn't work

I downloaded DA: O when it was free a few days ago and when I tried to play it I got a 'PhysX.dll file missing' error.

I reinstalled it, and got the same message again, and when I manually installed the file from NVIDIA - and then uninstalled that and reinstalled the older version that NVIDIA also offered - I got an error saying the NVCUDA file was missing.

I installed a legacy PhysX driver, also from NVIDIA, and I have no idea what that was supposed to do but it was offered alongside the older version of the PhysX software so I figured I might as well install it. I then reinstalled DA: O again.

And then I got the 'PhysX.dll file missing' error again. I've reinstalled DA: O a third time and it still doesn't work. I'm at my wits end, please help!