I'm maxed on my iMac at OS 12.6 and the App Store restricts download of Swift playground at OS 13 - How do I obtain an older version of Swift Playgrounds for 12.6?
iMac at 12.6 - No Swift playground?
This seems to be a common problem with the App Store: You need to have already "bought" the app when the older version was still current. See this guide ( https://www.makeuseof.com/how-to-download-older-versions-of-apps-on-older-iphone/ ) for example.