If you meant to ask for a download source for from a legitimate platform you already subscribe to, try using that platform’s offline feature (e.g., JioCinama allows downloads within the app).
For now, bite the bullet and watch the ad-supported version on JioCinema. Or, wait patiently for a potential remaster. The story of Manik and Nandini began in 2014, and it will always be waiting for you—just maybe not on a shady cloud drive. kaisi yeh yaariaan season 1 google drive