Two restarts, I get the same thing. Before the second restart I uninstalled the app completely using CleanMyMac X, and then after restart re-downloaded and re-installed app.
The only thing I have now is this in my Trash:
Dumping this ZIP file in my Downloads, then unzipping there creates a file called DEVONthink.mailbundle.zip.cpgz - which is another archive format??