Project Inteligence can't download the initial manifest.json and it seems I can't fix the issue.
Is there any workarround to have the offline documentation ?

ty

could I get a specific .zip location ?

Or actually I would like an path example

This would be a Project Intelligence issue, not a Draconic Additions issue.

Regardless, if you search for the repository "PIDocs" here on GitHub under the user "brandon3055", that contains all the documentation. Download that as a .zip and extract it somewhere, go into the settings of Project Intelligence after opening it up in-game, and select "Edit Mode". It will ask for the absolute path of the repository you just downloaded. Put it in, and you'll have the documentation.