Sequoia 15.5 Apple email archive Devonthink Pro 3.9.11 stopped working

Yes. This one: E-Mail-Import funktioniert seit dem Update auf DEVONthink Pro 3.9.11 nicht mehr - #3 by cgrunenberg

It’s in German though. What it says is that in DEVONthink 3.9.11 Mail import is broken and the previous version should be installed again for the time being. Christian provides the download link.

If 3.9.12 (or higher) is out already—I can’t say because I’m on a beta—then go for that one.