If you are on an older macOS version (like Catalina) and need a compatible version, the App Store will usually offer the "last compatible version" if you have previously "purchased" (downloaded) Pages on your Apple ID.
Open the App Store on your Mac and search for "Pages." If you are on macOS 11 or later, the "Update" or "Get" button will install the most compatible version. The DMG Fallback:
Apple typically does not provide direct DMG download links for older versions of Pages on its public website. Instead, the software is distributed via the Mac App Store. 1. The Mac App Store Method (Recommended)