HT202152: Mac App Store: Frequently Asked Questions (FAQ)
Learn about Mac App Store: Frequently Asked Questions (FAQ)
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All replies
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Helpful answers
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Jun 20, 2016 10:23 AM in response to cabc5500by Niel,If you're using a version older than 6.2.8, open the Mac App Store, click on the Updates tab, and install any Safari or security updates which appear.
If you're using version 6.2.8, you need to upgrade the computer's OS to at least Mavericks.
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Jun 27, 2016 6:22 AM in response to cabc5500by Eric Root,Check to make sure your applications are compatible.
Applications Compatibility (2)
El Capitan 10.11 Compatibility information
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.