I had OC 10.0.3.3 and want to switch to NC. So I took the latest version and according to https://nextcloud.com/migration/ it should work.
I choose the manual path. First deleted all OC files (except config and data) and then copied the new NC files. And started sudo -u www-data php occ upgrade. But I get this:
Exception: Updates between multiple major versions and downgrades are unsupported.
Update failed
What can I do?