How to download an older version of Logic Pro X for an older Mac...
There are some posts here which claim you cannot download older versions of Logic Pro X that are compatible with older Macs. This is incorrect.
I have a 2013 MacBook Pro and just easily downloaded the latest version compatible with McOS Big Sur. I opened the App Store on my MacBook, signed into my Apple account. Then I clicked on my name at lower-left, and scrolled through my list of purchased apps until I found Logic Pro.
I clicked to download it. The App Store told me the most recent version of Logic isn't compatible, then asked if I'd like to download a version that is compatible? I cliked "Download" and was good to go.
Easy peasy.
MacBook Pro 15″, macOS 12.7