Make sure you download it from the "Other Downloads" tab at curse.

http://www.curse.com/addons/wow/jamba#t1ther-downloads

Its in the earlier posts in this thread too, make sure to read through the thread for other's solutions so you don't have to wait too long for an answer

Edit: LOL theres a smiley face in the link! thats just a straightup copy and paste form curse