Now, today I installed the new release of RigManager 3.2.43. This worked. Then I did "Check for software updates" and RigManager found OS 8.54 as the new updateable OS. I let it do the update. It worked. Soon after, RigManager noticed me of a new OS update: 8.54. Ok, I said to myself: let it redo the update process. It did. Then, after closing RigManager and restarting it again (Windows 10, latest), it came back with the message of the new OS release as suggestion for an update.
Anyone else having this "feature"?