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Ok, you could buy 2 Pro licenses. Basically, you download and install a trial of Avast!, then purchase a license that comes via email to active the trial.
But…since Avast! Internet Security, the next tier product from Avast!, comes with a 3-use license by default(meaning it can be installed on up to 3 PCs), it might actually be cheaper to buy that, rather than 2 separate pro licenses (you can only use those 1 time).