Aach license of Puzzle Maker Pro is sold to be used by one single person on one single computer. However, we can fully understand that you may want to use the software on both your laptop and your desktop. This is allowed.
However, if more than one person will be using the software at the same time, it's only fair that you purchase multiple licenses. Incidental use, such as a spouse, parent or child helping you out for an hour or two, is allowed. However, if you have a VA (Virtual Assistant) or an in-house assistant who's also spending considerable time with the software, that person should have a license of their own.
To summarise: every person using the software should have their own licence to the software.