I could do a fresh install of a version 2.3.5, or 2.3.7 or whatever (using another db-prefix).
Then, I could take a backup from my currently running 2.3.4 forum and restore it in the newly installed version. That would avoid using the update procedure.
Is that possible?
Of course, I would have to adapt look and feel of the new version, but in total it might be less trouble.