Am 21.04.2020 um 14:45 schrieb Jürgen Gmach <juergen.gmach@apis.de>: […]

I suggest you try to follow the migration documentation ( https://zope.readthedocs.io/en/latest/migrations/zope4/index.html ).

The first step would be to get your installation to run on Zope 2.13. There are already several changes in-between since Zope 2.10. Maybe you even have to upgrade to some minor versions in-between (2.11, 2.12) to be able to migrate your database and code to a recent Zope 2 version before trying to migrate to Zope 4+. -- Mit freundlichen Grüßen Michael Howitz