Before you search for a pirated copy, consider the narrative reality. Christopher Nolan is not a sequel director (outside of The Dark Knight trilogy). He has stated in interviews that Interstellar was a closed loop. The film’s ending, where an aged Cooper steals a spacecraft to find Brand on Edmunds’ planet, feels open, but Nolan has argued:

YouTube is home to many "concept trailers" that use footage from other sci-fi movies (like Ad Astra or The Martian ) to create the illusion of a sequel.

However, if you're looking for a way to watch "Interstellar" or its potential sequel (if it gets made), I would recommend exploring legitimate channels such as:

Filmyzilla is a notorious website known for leaking Bollywood and Hollywood movies, including new releases. The platform has been a thorn in the side of the film industry, with many producers and studios accusing it of piracy.