There was this thread:
It’s an older thread, but might be useful. Can you access that .json link? Could be a way to test your network access. The json link.
And here is the json that lists all the community plugins, or at least the ones that were submitted and approved to be listed. (Not sure about that process.) This json has the names and github urls of the plugins. You can pull and install these repos yourself.
There is also YourVault/.obsidian/community-plugins.json
community-plugins.json is in this format, if you are attempting to install manually:
[
"dataview",
"readwise-official",
"obsidian-tasks-plugin",
"smart-random-note",
"calendar",
"periodic-notes",
"obsidian-zoom"
]
And the plugins would go inside YourVault/.obsidian/plugins/NAME-OF-REPO
