Return of Reckoning

Where do I find the latest version of these addons? Alot of the resources here are for older versions and I found a few newer versions of some addons. Also is there a guide or any kind of help for the must have addons? I play a warrior priest and not sure what addons I should be using because some do not work in part or fully.

They aren't all in one place, at least mostly not.
Sullemunk usually posts threads for his addons which contains the latest versions.
Various other threads, including my own pack, and endless others
Idrinths webpage here https://tools.idrinth.de/addons/

I suggest ask on advice chat in-game for must have add-on's. Most of old ones work. Only few minor or less used or replaced with other are broken. Like Squared now is replaced by Enemy. And yes, best chance to get working add-on's is idrinth website.