Upon purchasing your Digital Planner, you'll receive a download purchases email (this email will be separate from your traditional order confirmation email/receipt).
When you click on the link, it will take you to a separate window where your digital goodies will be accessible via download.
You will receive your files as a "zip file". Click on the "zip file" to uncompress the files and unlock your digital goods.
From there, you are able to import your digital files to your preferred app (e.g. Goodnotes, Notability, Noteshelf, etc.)