You have 2 installs permitted. You can just install Print Music on the new computer and leave it on the old, just in case. Or, probably best, deauthorize Print Music on the old machine (Help Menu) and install on the new.

IIRC PrintMusic has only one authorization allowed at a time, so you would have to De-authorize PM on your first computer before you can authorize it on the second.

http://www.finalemusic.com/products/finale-printmusic/resources/system-requirements/ 

(AFAIK only full Finale allows two authorizations.)

Thanks for setting me straight!

How do I deactivate it?  I have two Print Music programs, one each on my Mac and PC.  I want to upgrade my Mac computer.  I suspect I need to find the correct serial number and deactivate it (I need help finding the serial number) and then activating it on the new Mac.  Is it that straight forward, or are there other things I need to do?

I am not a PrintMusic guru (perhaps Mike Rosen will check in soon) but in full Finale the menu option to Authorize/De-authorize is in the Help Menu, and the serial number is shown on the About Finale splash screen also in teh Help Menu (on Windows; on Mac I think it is in the Finale menu).

If you can log into this forum, you should be able to log into your My Account page at the Finale web site with the same username/password, unless I am mistaken.