Help with downloading older version of Pages 8.1

Hi, thanks for previous advice here on downloading an older version of Pages for a Mac using High Sierra 10.13. I duly signed into App store, held the option key down as advised while opening purchased apps tab. Held option key again while clicking on Pages and was offered the following message:

"The current version requires macOS 12.0 or later, but you can download the last compatible version". However on clicking 'continue', all that happens is a never ending cycle of spinning wheels and the message reappears; click again, more spinning wheels and the message reappears. Has anyone any ideas on how to break the cycle or perhaps an alternative safe source to download from? Sick of writing a document on a far more recent ipad then unable to open/edit on Mac....