– Tekken Tag Tournament 2 was officially released only for PlayStation 3, Xbox 360, and Wii U. Any “PC download” claiming otherwise is a modified or pirated copy (e.g., RPCS3 emulator + illegally obtained ROM).
If you have the full 18GB version and want to convert it to a "highly compressed" state for backup: Tekken Tag Tournament 2 Pc Download Highly Compressed
This is the most popular method. It allows for high-resolution rendering (up to 4K) and even supports online play through the RPCN network . – Tekken Tag Tournament 2 was officially released