Problem instaling add-on

I’m trying to install the Gaea add-on (GitHub - BenjaTK/Gaea: Procedural generation add-on for Godot 4.) but despite following the instructions, the add-on doesn’t appear
I’m on version 4.2.1 and I used the add-on on it’s most recente version

I found what I did wrong, I was actually using the wrong project