Deactivation - possible, or not?

On http://notionmusic.com/products/notion4.html it mentions that "Each purchase of Notion 4 comes with two (2) installations." Yet when I tried uninstalling Notion 4 it did not mention anything about deactivating. I'm often in a position where I'm having to backup and restore past OS images as part of my workload, and the last thing I need is for Notion's servers to think I've got more copies of Notion running than I really do - and having it prevent me from reinstalling the program under a scratch OS.
So: Deactivation - possible, or not? Should I be aware of any protection-related issues here, or should I not really be worrying about this? Apologies if this has been brought up before, but I didn't see it mentioned in the FAQ.
So: Deactivation - possible, or not? Should I be aware of any protection-related issues here, or should I not really be worrying about this? Apologies if this has been brought up before, but I didn't see it mentioned in the FAQ.