NC 15.0.7: Webupdate: Error extra files

I have installed NC 15.0.7 and want to upgrade to 16.0.2 as recommened in the overview. (opensuse 15.1 and postgreSQL10)

But I get the message:
Check for expected files
The following extra files have been found:



when do the update. In the NC directory are two directories with this name: ./search/ and ./core/search/

But this is a fresh installation at his first heartbeats. There are only two additional ‘Apps’ (Calendar and Contacts) both from the ‘official’ repo. Further the colour and the logo are changed.

What should I check to get the updater running.