Open core legacy works great. I was able to put 15.x on a mid-2011 MacBook Air works great with latest app versions, even takes patches. It would also let you downgrade but that would probably still have the app problem you're currently facing because they're not installed anymore.
I recently discarded my mystery box when we moved, after 30 or so years. I looked through it for nostalgic reasons beforehand, and found far too many serial 25->9 cables over 10ft, an IDE ZIP drive cable (purple) and some octopus thing you could transfer files between an old PC serial port and an Apple II with. Memories.
@99_Colorado Same here wife got it but still waiting. Thankfully hers is the model Y the cooler stopped working in last fall so cold drinks are back! W00t!
@MBDan7 Someone should start injecting this into the narrative. 30B??! He's basically Elon Musk. And we all know what liberals think of Elon Musk. Bring it home for a change! He's an eliteist billionaire.