Click the Attach button that appears, click the name of an attachment or choose Save All, then choose a location. In the Mail app on your Mac, move the pointer over the header of a message. And I had locked the application prior to announcements of its demise. Neither of these were suitable for my older Macs (pre Snow Leopard) but I already had a Google Notifier version in each of my Macs. How To Download Gmail Application For Mac.Or an add-on to an existing supported browser that could allow you to see gmail when already online in a browser. There used to be an item known as Gmail Notifier for Mac, and this recently (last week) was discontinued by google citing their browser was their answer.