

(Note: The Purchased tab disappeared with MacOS 10.14 - High Sierra might be the last OS to handle this step) Repeat for all three (five, if you installed iMovie and Garageband from your original DVDs) applications anyway, since from then on this application will appear in your Purchased tab. Then it will attempt to update the application, and fail, telling you that they require 10.14. The store asks for purchase confirmation and your password (if required by your settings). Selecting one of those apps will take you to the app's page.
PAGES FOR MAC FREE DOWNLOAD INSTALL
Install an old iWork suite (from your original installation medium, or use the iWork ’09 trial suite that can still be downloaded from Apple.If you lack these (either because you deleted them or never had them installed first hand) and never registered the purchase with your Apple ID, you need to work your way up through the missing years of upgrading, including the registration with your Apple ID to be offered an installation on any system that's older than the currently shipped Mojave:

You need to have an old version of Pages, Keynote and Numbers installed in your Applications folder to be able to update them.
