Pages for Big Sur

You can use Pages for iCloud, Pages for iOS, or Pages for iPadOS — the latter two with iOS/iPadOS 16.6, but without any Pages for Mac installation history, you would need a Mac capable of running macOS Monterey 12.3 or later. Future Pages updates may require an even newer release of macOS than Monterey.

For documentation on the three Pages implementations above, see Pages - Official Apple Support

Just to add, you need a Mac that can run macOS Monterey or later.

Mee_Mee_2023 wrote:

How do I download iwork pages etc for BigSur. I have not downloaded previously with my apple ID so I can not get it that way

Then it's not possible without getting a newer compatible Mac.

+1 I keep forgetting the apps that are in iCloud. I guess because I never use them.