If I'm right, the old version of SDK 2.8.1 named VRD (Visual Remote Debugger) is not more compatible with A8, the newest version of SDK 2.8.3 is named as PVD (PhysX Visual Debugger) and works.

Downloads & Licensing
How to access the free PC binary PhysX SDK, EULA, and more

Regards, Robert

Quote
Everything should be made as simple as possible, but not one bit simpler.
by Albert Einstein

PhysX Preview of Cloth, Fluid and Soft Body

A8.47.1P