Can I install LR4 on MAC after I already installed it on 2 different PCs?

I have installed LR4 on my laptop and desktop, both PCs. If I purchase a MAC in the near future can I install the version of LR4 I already have on it without purchasing another license?  If not, do I have to physically purchase another copy of LR4 since I would have used up my 2 allotted uses? Or is there a way to purchase an additional license online without buying another physical copy? And if bought online, would the additional license(s) be the same amount?

If you need to run Lightroom on all 3 computers on a continuous basis then you'll need another license.
1 license = 2 activations (2 x PC)
2 licenses = 4 activations (2 x PC plus 1 x Mac and one free activation for use on another computer)
Same price for each extra license.

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    Ethan Hua CHN
    TechNet Community Support

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