Step 1: Click on the Download button on the middle left part of the web application.

A download popup will appear. You can choose either PNG, JPG, PPTX, and PDF. 

PPTX and PDF option will give you additional page options for your file. You will see the Page Size/Trim, Page Numbering Format, Number of Solutions Per Page, and Start Page Numbering. See screenshot below.

Step 2: Click Download.

It will now automatically download your puzzles.