It installs the plugin if you have the link to github of the plugin. But not all authors leave the link, like here
I have to download 5.0 version of the engine to download the plugin for 5.1… again…
epic games MUST add the feature, the link, API, whatever, idc, but devs should have the possibility to download god dаmn zero-weight essential plugin.
There are threads (here and here) about this feature request