Cannot de-authorize Mariana plugin

I am moving to a new PC and want to deauthorize my Mariana plugin, so I can then activate it on the new PC. When I select the ‘Deauthorize’ option, I get the following error message, whether I select it from the VST or from the standalone version. Any ideas?

moog.JPG

No explanation but they deactivated it for me, so I suppose that’s something. (BTW, evidently you now need to report problems via their ticket system, not to the old appsupport@moogmusic.com address.)