Steam builds often have different incrementation or packaging. A "UL" or "Exclusive" tag usually implies this is a build that was preserved before Rockstar sunsetted the old standalone launchers in favor of their unified Rockstar Games Launcher.
This isn’t the GTA V you played. This is the UL Edition . Exclusive to no console. No store page. No trailer. It exists only on this drive. grand theft auto v gta 5 v108771 v136 ul exclusive