Each time you start Pathways, it will display a panel inviting you to register it. After registration, you will get a free license key that makes that notification disappear, so that you don't have to bypass it each time you start the program.
If you like the free software, please be sure to register it. That's pretty much the only way the author of the software will know if people are using it, and what is their impression of it. Without that feedback, it becomes very discouraging to the author and less and less likely that further new releases and improvements will be forthcoming.
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