Where do I find Logic Pro 12.7.6 for Monterey?

I bought my original version of Logic in 2009, after having used Emagic Logic in the 90s. In 2009 Logic was called "Logic Studio", in my case version 8. It came with a serial number and a Support ID. Years later, when I had switched to another Mac – 27" iMac running 10.13.6 (High Sierra) – I managed to upgrade to Logic Pro 10.4.8. Works great. Now I want to install a second copy of Logic Pro on my MacBoook Air running Monterey, 12.7.6. Since I bought the application pre Apple ID, the AppStore is of no help, nor is the Apple support system, which gives me the runaround. I'm pretty sure I need Logic Pro 10.7.9., but the version I downloaded from 'a' site doesn't work (too recent) and they don't answer my emails *****

Your help would be greatly appreciated. Thanks in advance!

[Edited by Moderator]