Both the User Name and Registration Key must be correctly entered before the software turns itself into the registered version. See this step by step guide for help.
Keys from PerformanceTest versions 1 to 8 will not work in PerformanceTest V9, but you may purchase an upgrade at a discount.
If you purchased PerformanceTest 8.0 within six months of PerformanceTest 9.0 being released you are entitled to a free upgrade to PerformanceTest 9.0. You can request a new key from the PerformanceTest free upgrade page.