The game was delisted from Steam in 2021 due to the GFWL shutdown, but you can still activate a key:
Use a software like WinRAR or 7-Zip to extract the downloaded files. street fighter x tekken pc download highly compressed link
Websites offering "highly compressed" versions (e.g., shrinking a 10GB game to 500MB) typically use extreme compression techniques that can damage the game's integrity or hide malicious software. Malware & Security The game was delisted from Steam in 2021