Legacy (non-app-store) downloads
Note that there is no registration if you downloaded from The Mac App Store.

You can download and play Puzzles Forever without registering.
You can play using any of the built-in pictures without limits.

You can import your own pictures to use as puzzles,
but without registration, they will begin partially completed.

If you purchase a registration number and enter it into the program,
then puzzles using imported pictures will no longer begin partially
completed, and you can enjoy assembling them from the start.

You will also be helping to support shareware,
and the people whose hard work creates shareware.

Registration costs $15 US.

The Kagi store that used to process purchasing is no longer in business.

Use the contact page and write that you wish to make a purchase. Purchasing is processed via PayPal.
You will receive a friendly reply to confirm which app(s) you are purchasing, with the address to send payment to.
The registration code(s) will be emailed to you following payment.