When you install AddOns there are quite some issues to consider. AddOns need to be:
in the right location
applicable to your game version (Wow-Mania is 3.3.5a)
constructed correctly. They may be defective!
correctly activated

Lets start with the obvious: On the page at which you select your ...

I saw a warlock running around with a staff of this name. But where can it be obtained?
I can only see a druid staff in the armory, but this was a caster staff. But where to get it?