Old Script "Additions" Missing?

Did get any joy from posting in another thread so I thought I’d try my own.

In the ‘about these scripts.pdf’ doc, it states “The folder is divided into three sub-folders”, one of which is the Additions folder that “contains scripts extending and integrating DEVONthink tightly with
third-party applications”. Seems somewhere in the last couple of releases we’ve lost these or they’re somewhere else and I can’t find them. I’ve found the ‘install addons’ functionality but I get no feedback on selecting that about what just happened (no errors in the console either).

Can anyone shed a little light here?