If u wish to get up to date addons for your WoW client i recommend to use Curseforge.
Heres a link to the download page. Link
So you install it and it will scan your computer for any games. WoW will be displayed or if u are running different version of the game u CAN manually add the directory of your game to the application and it will mod that particular game of WoW
retail are my versions of WoW for example:
WoW Warmane WotLK
WoW Burning Crusade
WoW Shadowlands (Covenant)
So u can select and add addons as you please. Easy search function and also updates addons.