403 status code when installing asciidoc plugin from disk

I recently upgraded to IntelliJ 2022.2.2 on my Mac OS Monterey version 12.6 Macbook Pro.

That meant reinstalling plugins for PlantUML and Asciidoc from disk.  

The PlantUML installation went fine.  

The Asciidoc 0.37.54 install failed with status code 403.  

Why does the installation have to call out to a server when I install from disk.

My machine is behind a company firewall.  Direct access to the Jetbrains plugin server is blocked.  

How can I get the Asciidoc plugin back?

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