Actually, I had the “5.5 isn’t installed” error message on my Mac, so I did the following:
Moved Nuendo 5 to the trash, temporarily.
Moved Nuendo 5.5 application out of the folder it was in. (Which the original installer created.)
Applied update - no problem.
Reversed first two steps, all OK.
It seems that the checking program is a bit stupid…
Regards,
John