Thanks for your help.
When uninstalling Mariadb-10.1.22 I was asked to delete the database. I said no.
For a new installation, Setup wants to have an empty folder, that is, no databases.
So I installed, stopped the service and replaced the Data folder with the old one.
Now the service can not be started anymore.
MariaDB re-installed, service stopped, and ONLY my databases copied into it. T
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