Yes! As per your fellow Knight, the installers for the RU are MSIs, not MSPs.
When you go to the portal via the link Rigo provided, you need one of the Platform installers and also the URT:
The MSIs are in the Platform archives for both server OS types, along with the new OpenJDK installer.
Note that running the URT as well as performing the subsequent Migration is required for upgrading to 16.0 RU1, aka Release Update 1, or 16.0.1.