I just finished some testing. Success! I had the same issue with Archicad 23 (build 5003). I installed a new version of Archicad 23 (build 3003) and then I was able to install the Direct Link plugin. I then updated Archicad to Build 4006 from within Archicad. The Direct Link plugin continued to work. Then I updated to 5003, only available as a preview version downloaded from Graphisoft.com: https://www.graphisoft.com/downloads…ULL&version=23
After updating to 5003, the plugin still worked!
Hopefully this works for others.