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It's not just Apple developers who get to try out the new software - if you would like to be a public beta tester your can find out more about that scheme here: How to get the latest Mac OS beta.
If you'd like to find out a bit more about mac OS High Sierra before downloading it, read our comparison ofmac OS Sierra vs High Sierra to find out how it compares to the previous version. Following WWDC in June Apple issued a beta of High Sierra - we expect that the same will happen with mac OS 10.14.
Open Disk Utility (in /Applications/Utilities), select your startup drive from the list on the left, click the First Aid tab to the right, and then click Verify.
If Disk Utility finds problems, you'll need to boot from a different volume to perform the actual repairs using the Repair Disk button.
Some people will be able to test the beta out on their Macs.Updating your Mac to the latest version of the Mac operating system is really easy, free, and not nearly as time consuming as it used to be.However, there are a few things we recommend you do first to ensure things go smoothly, we run through these, as well as instructions for downloading and installing the latest version of the Mac OS in this tutorial.If space is looking tight, here's an article about freeing up space on your Mac.You should also make sure that your Mac is completely healthy before installing a big update to the system.