License question

I've been browsing for notation software and I'm really excited about what Notion seems to offer in terms of blending notation and DAW-like functionality. Before I go ahead and place an order, though, I have a question regarding the licenses. As I understand, I get two licenses so that I can install Notion on two different computers, right? What I am wondering is whether it's locked to a single OS. I use Windows for my main workstation, but I'd like to be able to install Notion on my MacBook Pro as well, so that those boring train- and plane-rides to conferences can be filled with music-making. 
Probably a stupid question, I just wanna make sure. I've had some experiences with really odd license terms previously.
Oh, one more thing; Notion is currently 32bit, right? Any idea whether a 64bit update is in the works? With various orchestral libraries, the 32bit RAM limit is quite severe.

Probably a stupid question, I just wanna make sure. I've had some experiences with really odd license terms previously.
Oh, one more thing; Notion is currently 32bit, right? Any idea whether a 64bit update is in the works? With various orchestral libraries, the 32bit RAM limit is quite severe.