While the temptation to watch Kaberi Antardhan or Bhoot Pori for free is high, remember that the "Extra Quality" you are chasing is a façade. The only place to get true extra quality Bengali cinema is on legitimate streaming platforms.
and Netflix : Both major global platforms host many award-winning and blockbuster Bengali films, often available in 4K or 1080p. Essential Bengali Cinema "Must-Watches" filmyzilla bengali movies extra quality