It doesn't much matter. PM 2009 won't run properly (if at all) on 10.12.6. You should plan on upgrading to PM 2014.5.

https://www.finalemusic.com/blog/compatibility-with-finale-notation-products-and-macos-sierra/

To turn the firewall on or off:

https://support.apple.com/en-us/HT201642

How do I do this for Windows 10?  I have Finale PrintMusic 2014.  The snip it below is where I am currently stuck.  The 800 number is no help.

PrintMusic 2014 for Windows is still a current product. There is no more phone support. Use the Submit a request link at the top of the page to contact MakeMusic directly.