It may be too old. What’s your Mac OS?

That's a pretty old version that is no longer supported by MM. Perhaps Mike H will see this and tell you how it can be done or not. Lilley an OS issue.

It depends on the age of your MacBook Air and your version of the MacOS — neither of which you have told us.

https://www.makemusic.com/wp-content/uploads/2012/11/FINALE_2012_SYSTEM_REQUIREMENTS.pdf

https://makemusic.zendesk.com/hc/en-us/articles/218377587-Finale-2012-and-earlier-on-Mac-OS-X-10-10-and-later