Mac/Windows same computer

If I have a double boot Mac laptop (Windows and OS X) and I install Xojo in both partitions, how many installations are considered: one or two?
It is obvious that I can not use both at the same time.

Two.

OK

Sadly 2 but can i ask why you are trying to have Xojo on both Windows and Mac ? Testing Purposes?

Yes. Exactly. Sometimes I travel and I don’t want to carry two laptops.
Anyway, it is not important because I don’t need to compile in these cases.