OS installers can automatically connect to Ethernet or Wi-Fi to download updates.
Install Mac OS X Lion on iMac 2017
Rather than using an installation disk, the MacBook is designed to retrieve the operating system directly from Apple over the Internet. If this doesn't work, you can still reload OS X from the Internet. If you don't have high-speed Internet access, you can use a USB flash drive or other external media. Mac computers that shipped with OS X Lion include the Lion Recovery HD, a separate partition on the hard drive to help you reload the operating system.
Lion Internet Recovery is more limited in its ability to connect to the Internet. A published author and professional speaker, David Weedmark has advised businesses and governments on technology, media and marketing for more than 20 years.
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Learn how to back up your Mac. It takes time to download and install OS X, so make sure that you have a reliable Internet connection.
If you're using a Mac notebook computer, plug it into AC power. Double-click the downloaded file to open a window showing its contents. Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware. Get connected It takes time to download and install OS X, so make sure that you have a reliable Internet connection.