Which are you running it on?
Limited update longevity; servers frequently block older strings. PETKA 8.5 - 8.6 - 8.8 ACTIVATION THREAD -REQUIREMENT
: You must supply your exact Hardware ID (HWID) , requested version (8.5, 8.6, or 8.8), and your computer name if requested by the key generator tool. Evolutionary Differences: PETKA 8.5 vs. 8.6 vs. 8.8 Which are you running it on