In case it helps anyone 10.2.2.49572 update failed via Rig Manager 3.4.51 (Win 11) when it was offered. Got to 36% updated then stuck and crapped out with a window saying contact Kemper. My rack unit just hung on the big green screen that says 'KEMPER PROFILER' until I removed power from it and it rebooted.
Tried again and it hung at exactly the same point (36%) so I downloaded the update from the website onto a USB stick and offered it to the Rack direct and this time it went in first time OK.
Just leaving this here as a solution as I've never had this happen before through all the software upgrades beta and full release over the years since we've had the ability to do them via Rig Manager.