Thank you for that nice simple answer.  I believe that is exactly what I need.  I just purchased the Desktop Pro 2020 and want to load/upgrade this new QB 2020 onto my existing Desktop (now using QB13)  AND also install it onto my laptop along with the current Desktop's QB company file. 

The 2 computers are not networked but I need to be away for 2 months and then can update company file with laptop version  - use for 2 months - then when back move the updated company file from the laptop and back to my desktop.  That should be OK and legal, correct?