P.S. I don't think it would work from your flash drive. I know WoW does, but that game is unique in that sense.
Well i'm getting a new hard drive (and motherboard/power supply/RAM) for christmas. So this is more a temporary thing. But it would also be nice to play LoL at my friend's house without spending 45 minutes downloading it.
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I don't see why it wouldn't work, but this is not a guarantee xD. I've never tried it personally.
I recommend trying it out *shrug*. Let us know how it goes