How do I upgrade from Leopard to Snow Leopard? Follow the Snow Leopard basic install instructions to complete the installation.In the Apple menu bar, select Utilities > Disk Utilities > Format. After reboot: Select language and Utilities.Check each update to apply, click the “Install” button and enter the administrator username and password to allow the updates. To manually update your Mac, open the System Preferences dialog box from the Apple menu, and then click “Software Update.” All available updates are listed in the Software Update dialog box. Click on the Download button to start downloading OS X Yosemite.
Visit the Mac OS X Yosemite page on the Apple App store.Check your system hardware and software by going to the apple menu, and choosing “About this Mac.”.How do I upgrade from OS X 10.5 8 To Yosemite?
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8, for free using the Apple Software Update application already installed on your iMac. 8 to 10.6 by purchasing the installation DVD for $19.99 (w/ free shipping), then up-date 10.6 to 10.6. How can I upgrade my Mac OS X 10.5 8 to 10.6 for free?