A "High Quality" ISO refers to a clean rip of the game that hasn't been compressed too much (which preserves the audio and video quality), but it cannot fix the inherent limitations of the PS2 port.
No legit Tekken 6 for PS2 exists. Save yourself the headache — grab via PCSX2 or Tekken 6 (PSP) via PPSSPP. You’ll get the real game, better performance, and no viruses.
I notice you're asking for a download link to a for PS2 — but there’s a major issue here: Tekken 6 was never officially released for PlayStation 2 .
Blocked Drains Rotherham