Always prioritize dumped files from your own physical retail disc. If you utilize online repositories, ensure they host legitimate PlayStation Network backups or homebrew content to avoid malware, corrupted files, and potential PSN account bans.
Tekken 6 was released for PS3 as a disc game and also as a digital download on the PlayStation Store (PSN). The official digital version is no longer available for purchase since Sony shut down the PS3 storefront for new transactions (you can only re-download previously purchased titles). Tekken 6 Ps3 Pkg Download