Save any work you have open, and then quit the applications you were using.
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And finally, though this may seem like rudimentary advice, transfer huge files (videos, very large photos and PDFs) to an external hard drive or another place to get them off your Mac.īefore you install a whole new operating system, take a few minutes to prepare so that your update will go smoothly. You might also verify or repair the disk (Applications > Utilities > Disk Utilities). I recommend running a cleanup utility, such as CCleaner, which is free and what I use at home. If you have an iMac or MacBook Pro from 2007 or later, you should be fine, although people with older machines may want to first clean up and optimize their machines slightly, especially if they've become sluggish over the years.
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Here's what you need to know and how to get it.