July in a row for the third, Apple is giving customers a prerelease version of the next Macintosh operating system, MacOS Sierra. The public beta is a chance for users to monitor the OS's progress and help the company identify issues before Sierra officially ships this fall. You can the test OS for free download, but be aware that beta software -- even from Apple -- isn't fully baked: Apps may be unstable, features might not work as you expect, and you may come across bugs and software incompatibilities. You may want to skip the beta and wait for the finished OS. But if you just can't wait, take a few preliminary steps before you install and run the prerelease version of Sierra. Can the Sierra is run by you public beta? First, check that you can run the public beta. Apple says the Sierra preview should run on MacBooks and iMacs from late 2009 and later; and MacBook Airs, MacBook Pros, Mac Minis, and Mac Pros from 2010 and later. Back up, then choose where to install Sierra Next, be sure you have a good, current backup of your primary drive. This doesn't have to be a chore: See our guide to backing up your Mac for advice. Consider installing the Sierra public beta on an external drive or a separate partition, not on your primary Mac drive. That real way, if something goes wrong with the beta, or if you decide you want to return to El Capitan, rolling back will be much easier. Download the MacOS Sierra public beta If you can live with the potential quirks and glitches of beta software and have a current backup, you are ready. The prerelease version of Sierra is available from Apple's public beta software page. You need an AppleID to join the beta program. After you sign in, click the MacOS tab and read the instructions. As you scroll down, click on the Redeem Code button. The Mac App Store should open and apply your redemption code for the public beta automatically. The download is big -- around 5GB -- but once it finishes, follow the onscreen instructions to complete the installation. Apple says you will receive updates to the MacOS public beta through the Mac App Store when they are available. Installing and uninstalling Sierra According to Apple, in the fall you'll be able to install the final version of Sierra over the public beta. However, if you want to remove the beta before and return to El Capitan then, you'll need to first erase the beta software, reinstall the latest shipping version of OS X 10 then.11, and restore your programs and files from the backup you made then. Of course, if you wisely installed the prerelease version of Sierra on an external drive or separate partition, you can restart with your primary drive just. Firefox 'Lorentz' arrives but with restrictions.
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