This allows you to play the console-quality version of Tekken 6. However, it requires a powerful CPU and a legally dumped copy of the game from a PS3 disc. Legitimate PC Alternatives
To play Tekken 6 on a modern computer, you must use emulation. Because there is no official PC port, there is no legitimate "license key" for Windows. PPSSPP (PSP Emulator): tekken 6 license key for pc game link
Because there is no native PC version, there are from authorized retailers like Steam or the Microsoft Store. How Players Access Tekken 6 on PC This allows you to play the console-quality version