You cannot put your PAK directly into the Professional Activation Center. The PAK is not a license. It's a token you use to generate a license. Please Redeem your PAK in the Licensing Portal, generate your license and use 'Save all' to save the license file. If you purchased a local license, you can upload the license file into the Professional Activation Center, restart your programs, and your product should work. If you purchased a network license, you will need to set up a license server. Documentation for the licensing process can be found:
- Packaged with your product: Nvidia Corporation > [your product] > License
- In the Professional Activation Center: Click the gear icon and click 'View documentation'
- On the Network Licensing Tools page that is accessible in the bottom menu of the Advanced Rendering site: http://www.nvidia.com/object/advanced-rendering-licensing-tools.html