Ah, I think the issue is: https://plugins.geany.org/addons.html doesn't state the page is for the "Addons" plugin.
Compare with for example: https://plugins.geany.org/autoclose.html This shows a broken image link for autoclose plug at the top.
Generally speaking, all the plugins pages for individual plugins geany could use above the "Contents" a title saying what the plugin name is.
---
So I find myself here because after installing the "geany-plugins-2.0_setup.exe" -- I don't see the addons plugin or the Tools menu option to copy file path.