Rhino 6 stalls when trying to update R5 Plug-ins

Rhino Rhino for Windows
1

When I launch Rhino 6 I keep getting the message that Rhino 5 plug-ins may have updates available to run in Rhino 6. At this point the program stalls and I cannot click on anything to continue. I have to force close it.
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I have gone through and uninstalled Rhino 5 and looked for anything related to Rhino 5 plug-ins. I can run Rhino 6 in safe mode but that is not very helpful.

I am running Windows 10 pro with all updates installed.

Any ideas how to solve this?

2

Hello - - none of those buttons does anything? Is there another dialog lurking behind another app window?

-Pascal

3

Pascal, no other window or dialog is visible. Rhino just goes into not responding mode and I either have to wait (which I have, and nothing) or close program.