It should work the same as any other DLC. it should be assigned to your profile and not the physical machine itself. If anything, when you get to your bro's house, load your profile and go to the add-ons section through the "games" tab and find the mechro add-on. If it has registered that you have paid for it, it should come up "download again". I would try dl'ing again, if given the option, and start up the game to check your results.
Starting small, FTW
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