The Installation
The procedure:
Shut down the computer and unplug the power
Plug in the Nvidia card that will be used for PhysX
Start up your computer
Install the appropriate drivers from Nvidia and AMD
Check and install the appropriate version of PhysX (see the list)
Download the appropriate version of the tweak (Windows 7, 32- or 64-bit)
Extract the files from the RAR archive
Run the tweak as Administrator (right-click the file and choose “Run as Administrator”)
Reboot your computer
Switching modes via the CMD file:
The relevant files are in the subdirectory
Run the desired function as Administrator