The existence of this has made its way to the internet, but i've so far been unable to find the corresponding nvi and package files in any recently released driver, official or otherwise. I'll post the package when the image poster uploads the installer2 physx package.
Physx 9.20.0221 is from Dell Quadro driver 442.83. I have removed the driver and zipped just the required setup & Physx files; PhysX-9.20.0221-SystemSoftware.zip
There's no change log but the binaries are different, nothing new added - just slightly modified as far as I can tell.
binaries can be different just because the digital certificates changed. There are no version changes, so nothing new in the code, but the old sha1 certificate has been dropped as of 9.20