Updating os x
However, before you visit Apple’s website to download the latest version of OS X, there are several steps you should take first to ensure the upgrade process goes as smoothly as possible.
Click the "More" button next to any OS X Update package in the Update section and read the update description to see if any OS X Update packages contain the latest firmware.
These are instructions on how to update the operating system of your Mac to the latest version of OS X.
If you aren't already on OS X 10.9 Mavericks you can upgrade for free by visiting this link.
They are downloaded to your Mac and installed by mounting the associated disk image and launching the Installer package therein.
There are two types of Standalone Updates: Individual and Combo.
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Just as Apple regularly updates its i OS mobile operating system, the company also periodically updates its OS X operating system for its Mac Book Pro computers.