Makes perfect sense.
So.....my plan:
1. Uninstall my new 2021 from my new laptop
2. Install my 2020 version from my portable HD to my new MacBook Pro laptop. Can I just copy and paste the old version into the laptop?
3. I have a portable HD coming tomorrow from PG with the 2021 version on it. How do I best install this on top?

Thank you.