Seems AC has updated NVmax v4.00.47. No word on whats new but it now looks like AC is giving NVmax away for free. Here's what he's saying:

Want more control over your NVIDIA graphics card? Use NVmax to control DirectX, OpenGL and System properties that effect performance, quality and stability.

NVmax is now free for all use. Please see the license agreement for further details. Download NVmax v4.00.47 or browse our archive. We just uploaded. ;-)