Non App Store License

I have a license to iStopMotion from MacHeist 2. My kids love the app. They have a Mac at both my house and their Moms house - do they need an additional license for their second computer? They would only ever us it on one or the other. It seems that the App Store version allows 5 installs - what is the license for my version? I have no qualms paying if I need to I just can not seem to figure that out from poking around the various menu options and FAQ’s.

Thanks

“Regular” licenses are not compatible with the Mac App Store technically.
You may however install the license on a second Mac if you don’t use it at the same time.

Thanks, I assumed they were not technically compatible but just wondered about the actual license terms.