I would like to make appointment at Woodcliff NJ location
I have rather old mac air book and need help updating the new version of MacOs
Question marked as
Best reply
To install an older version of macOS, read How to download and install macOS - Apple Support. If you run into trouble please write back.
It would help if you identified your particular model MacBook Air: Identify your MacBook Air model - Apple Support.
It shouldn't be necessary to go to an Apple Store, but if you need to do that everything starts with Official Apple Support.