The rem.uz service was a file-hosting site popular in the RPG community for storing and sharing high-quality PDF scans of game books. When that service shut down or became inaccessible, archives like the one on The-Eye served as a backup to preserve the collection.
The link you provided points to which is a public digital archive. https://the-eye.eu/public/books/rpg.rem.uz/
However, since the link suggests it was once a collection of (likely from the /rpg.rem.uz/ archive on The-Eye), I can offer you a few alternatives: The rem