Well to start, I don't have the "Install from File" button, mine is just "Install Addon", but I just figured that to be the same thing.
It adds the addon to the list, but whenever I click the button to enable it, this pops up in the console.
http://puu.sh/5nBpN.png
I'll try redownloading again and report back.
Yep, just tried again, still wont let me enable it.