If you have access to another Mac running a version of MacOS currently supported by the App Store (As of Jan 2020, that would be 10.14 (Mojave) or 10.15), you could associate your AppleID with an account on that Mac, download (and thus register) the Applications you want to install on your older Mac there, and then use the Purchased tab on the older Mac to reinstall older versions of those apps on the older Mac.Create presentations that are interesting and engaging with Keynote. (Version numbers applying to High Sierra as of January 2020) You now have Pages (v8.1), Numbers (v6.1) and Keynote (v9.1) directly in your Applications folder. Upon selecting install, you will be prompted if you want to install the last supported version for your OS release. The applications are listed at the top of the purchased list. So let's loose them: delete the iWork09 folder from Applications (or move it to the Thrash). Now your purchase is linked to your account, and you may reinstall those applications if they ever should get lost.(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.

Launch the Mac App Store, go to the updates tab, and activate show incompatible updates.

You still have an iWork 09 folder inside your Applications folder, containing trial versions of Pages (v4.3), Numbers (v2.3) and Keynote (v5.3).

I cannot verify if this step is necessary since I had installed that upgrade.

The trial suite can be upgraded to iWork 9.3 with a downloader available at Apple - Support - Downloads.

It doesn't seem to be necessary any more - I had only launced one of the programs.) (This step was suggested by the instructions based on the 2014 article.

Launch Pages, Numbers and Keynote, then quit each app.

You now have an iWork 09 folder inside your Applications folder, containing trial versions of Pages, Numbers and Keynote.

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.

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