Vinnaithandi Varuvaya never got the big 4K restoration it deserves partly because of poor returns from piracy. Every illegal download reduces the financial incentive for studios like RS Infotainment to invest in a proper remaster.
If you truly want the best possible viewing experience for Vinnaithandi Varuvaya today, you have several legal options that deliver superior quality to any shaky 4K download.
The official channel Sony Music South or Rajshri Tamil has uploaded the movie in the past. However, YouTube compression (even at 1080p) is far inferior to streaming platforms. You will see compression blocks in dark scenes (like the “Aaromale” sequence). Not recommended for a “better” experience.