Asa's Amazing Alternative Addon Downloader!

Myrr suggests using the Curse client to update addons, but I find that WoWMatrix (www.wowmatrix.com) is a useful alternative. The program is free, and allows you to directly download many addons and installs them itself, no fuss! as with Curse, it searches for updates with addons, and you can even launch wow directly after running updates.