Upgrade installation fatal error

Hullo,

I get the attached notification when running the update to 3.5.1. Installation then crashes with ‘fatal error’. It seems I can still launch 3.5 without problem, but am keen to explore the new improvements! What am I missing?
error.png

Found this thread and will try uninstalling and reinstalling everything from scratch…

https://www.steinberg.net/forums/viewtopic.php?f=246&t=190160&p=1004999

EDIT: that did the trick. Weird…