iWork 2020
How to get versions of iWork for macOS 10.14.6
MacBook Pro 13″, OS X 10.11
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There is no iWork 2020 product. There are Pages 8.2 - 10.1, Numbers 8.2 - 10.1, and Keynote 8.2 - 10.1 versions for macOS Mojave. Presently, Apple requires that you have macOS Big Sur or later installed to download the current versions, all v11.2 from the Mac App Store. Apple does not provide user downloads of past versions of these applications.
You can try the following on Mojave. Launch the Mac App Store and sign in with your Apple ID. Press cmd+0 (zero) to open the Purchased panel. If any Pages, Numbers, or Keynote icons appear with an Update button, click that. You will receive a dialog informing you that you need Big Sur or later to install these applications. Then, it may present another panel offering to update Pages, Numbers, or Keynote to their last compatible versions for Mojave. This may happen or the dialog will blink and install nothing. Success or failure, at this point, you are done obtaining versions of these applications for Mojave.
If the second paragraph did not work out, then your only option is to use the iCloud versions of these applications, or iOS/iPadOS versions with their specific operating system requirements.