This one is fixed, but I had to remove your 'unique' statement on Contacts > user_id because in the sandbox you have 3 items with user_id = 0
You might have recieved an error report on your mail box about your fatal.
I am currently working on that for this monday's feature.
At this moment, it does not report correctly (anymore) the errors when you have an installation problem. In your case 'Unique' problem, so you couldn't understand your fatal.
So... Fixed.
But I tell you, until tonight, if you have an installation error about DB, you will not be noticed because I am working on that. So in case, your component will be missing, and so you don't have a clue about the problem.
EDIT : I mean, in the sandbox.
Everything works for your downloaded component.
Remember to re-activate the unique statement on this field (once you have fixed the problem, setting differents values on those fields)