Cannot install Mail plugin on DEVONthink 3.0beta7

DEVONthink
1

I am unable to install the Mail plugin on two physically different machines. One is running 10.14.6 and the other 10.15 Beta (19A546d). Both machines give a message that Mail has disabled the plug-in.

The message on 10.14.6 is:

Mail has disabled the following plug-ins:
DEVONthink.mailbundle
Contact the makers of these plug-ins for versions that are compatible with Mail 12.4.

and the message on 10.15 Beta (19A546d) is:

Mail has disabled the following plug-ins:
DEVONthink.mailbundle
Contact the makers of these plug-ins for versions that are compatible with Mail 13.0.

I have followed several suggestions in these forums about ensuring that DEVONthink has Full Disk Access and manually deleting the DEVONthink.bundle in ~/Library/Mail/Bundles with no success. I checked and I have Read & Write to that directory, by the way. I have also restarted multiple times and ran First Aid on the disks. I also reinstalled DEVONthink on the machines, although I copied a new download over the existing install instead of actually deleting it first.

Any ideas?

2

Same problem with me.

3

This was already reported and responded to here:

4

So, for what it’s worth, I did a complete restore from a TimeMachine backup and the plugin is enabled and working on 10.15.

5

A complete restore of… ?

6

The entire machine. Operating system and all.