I removed the files from the installation directory but now no upgrade is offered:
sudo -u wwwrun php /srv/www/htdocs/nextcloud/updater/updater.phar
Nextcloud Updater - version: v25.0.3-2-gd49ee0d
Current version is 25.0.11.
No update available.
Nothing to do.
It doesn’t matter if I paste the files back into the installation folder or not. Only above message is shown.
@jospoortvliet Thanks for the info. Update from 25.0.11 to 25.0.12 started again with the “extra files”-error. But after removing them from the main directory update ran through without problems. Running updater again performed upgrade from 25.0.12. to 26.0.7 without problems.
Upgrade to NC27 has to wait, because openSUSE Leap 15.5 doesn’t offer recommended PHP-8.2 at the moment. But no problem.