Can I Enable Add-Ons On The 10 Day Free Trial In World Of Warcraft?

[Mark]

I was just wondering because if the leveling guide im thinking of using works well then i will re activate my account but until i know suck i don't wanna start so i was wondering if i can activate any add-ons during the 10 day free trial. (Ps: i didn't download if with the cd's i downloaded the full version when it asked to download trial download or full download but it was still free and didn't ask for any cd keys or anything)