More than 2 installations

Good morning (o;

Hope this is the right place to ask this…

If I want to use a product on more than 2 installations…can I just buy the same product again or do I need to setup a completely different account for it?

Reason for asking: My girlfriend is impressed by Gigapixel AI and wants to use it as well…but I already use it on two of my computers…

thanks in advance

Nobody knows this or has the need to run Topaz software on more than two computers? (o;