Add ons don't work ingame

Hi everyone,

I've reinstalled WoTLK again after a long break on my new pc. I've downloaded all the add ons I've had before. They're in the AddOns folder and the AddOns folder is in the interface folder. All my files are unzipped and in the AddOns folder. I have the AddOns tab on my character screen, I've checked the ones I need and checked "Load of out of date AddOns". The problem is, I don't see my any add ons in game. They just don't work. I hope you guys can help me fix this issue.

Sincerely,

Gardly

What are the specific addons? I know multiple people including myself are having trouble with Grid.