I just saw that my reply (through email) to your question below was bumped. 

I just purchased a 2022 LT Mac copy a few days ago. I did not intentionally run an upgrade because I had JUST purchased and installed it.

When I click on "check for updates" nothing happens. How to run an upgrade then?

When I click on About AutoCAD LT, it shows it as version 2021.

When I click on Save As, the most recent version I see is 2018.

I am coming from a 2015, which was supposed to have been a perpetual license...

thank you.