I got it working here with %windir%\System32\....
Guessing the x64 ServiceUI.exe does not have the virtual mapping for sysnative.
I guess the x32 version would work fine, but I like to use x64 on x64 systems, so this change is just fine
Thanks for a great solution by the way
This looks to be the perfect solution for upgrading our computers to the newest version of W10 on systems with both English and Norwegian System UI as default
If you happen to be in Oslo anytime, I'll buy you a beer
-Jannis