There are two different versions of the software - one for Windows and one for the other computer - so, yes, if you wanted both you'd need both bits of software. Not something we've been asked before, TBH.
@Alpha_Hunter Thanks for this. It looks like NOD32 is the only common one with this problem. I have to say I have a low opinion of it; I installed it once on someone's recommendation and it trashed my entire PC, it's the one and only time in decades I've had to do a full restore from backup. Normally you can add a file as an exception, and any sane virus checker would ask you what you want to do with it before just deleting executables.