The first thing to find out is if your Mac can run mac OS Sierra.Apple hasn’t published this information on its website yet, but during the presentation of the new operating system at the World Wide Developer Conference in June, a slide revealed the following compatibility information: This is simple, for the most part, with the exception of exactly what “Late 2009” means.Apple's OS X Mavericks is now available for free from the Mac App Store, and if your system meets its minimum requirements then you might be considering installing it.However, you may be concerned about whether you need to prepare your Mac for the upgrade.Instead of having physical media (a DVD) to install from, you use the Lion installer app you download from the Mac App Store.
Following the annual schedule that Apple has kept to for some time, operating systems for both the Mac and for i OS will make their debuts in the coming weeks.
Another step to consider is to run a few maintenance routines on your hard drive before installing.
At the very basics, reboot the system into Safe Mode and then use Disk Utility to check the hard drive for errors.
If that sounds like a lot of work, you can get a Mac cleaner like Clean My Mac for the job.
That will give your Mac a basic system cleanup, but Clean My Mac is going to come in handy after the update as well.