I'm guessing, but it appears the lack of connections in Add-Ons Central these days is related to the demise of third party websites dedicated to mods, in particular this one:
So now, all you see are the skins made available by the company itself on their server:
We must therefore rely on our Mods forums in which not all important threads are stickied. Plus, there is this speculation:
What has happened to the Mods?