Proceed with caution, use a VPN, scan your downloads, and enjoy the best tag fighter ever made.
Tekken Tag Tournament 2 was never officially released for the PC, it can be played on modern computers using emulators for the PlayStation 3 (RPCS3) Wii U (Cemu)
(Note: Tekken Tag Tournament 2 was never officially released for PC. You are likely looking at a ripped console version running via emulation or an arcade rip.)
Go to the official RPCS3 website and get the latest version. Install it on your PC.