Aug 03, 2017 A: Because some App running on Mac OS X like Skype. Alway update and can't lunch and install on old version of Mac OS X and some reason. As with any software update, a backup is needed to protect valuable data. Installing a new operating system, even its Mac OS X 10.11 El Capitan, may lead to unforeseen problems difficult to. Oct 29, 2012 I think I have finally convinced my wife to update her iMac from 10.6.8. Mine is at 10.8.2. That is, I bought Lion and Mountain Lion, and App Store on her machine says they are available for download and installation. We use the same Apple ID for things like this. Question: Do I install.
If you've upgraded to macOS Mojave or later, follow these steps to keep it up to date:
To find updates for iMovie, Garageband, Pages, Numbers, Keynote, and other apps that were downloaded separately from the App Store, open the App Store on your Mac, then click the Updates tab.
To automatically install macOS updates in the future, including apps that were downloaded separately from the App Store, select ”Automatically keep my Mac up to date.” Your Mac will notify you when updates require it to restart, so you can always choose to install those later.
If you're using an earlier macOS, such as macOS High Sierra, Sierra, El Capitan, or earlier,* follow these steps to keep it up to date:
To automatically download updates in the future, choose Apple menu > System Preferences, click App Store, then select ”Download newly available updates in the background.” Your Mac will notify you when updates are ready to install.
* If you're using OS X Lion or Snow Leopard, get OS X updates by choosing Apple menu > Software Update.
Learn how to update your iPhone, iPad, or iPod touch to the latest version of iOS.