What Is a Checksum (and Why Should You Care)?
A checksum is a sequence of numbers and letters used to check data for errors. If you know the checksum of an original file, you can use a checksum utility to confirm your copy is identical.
What is the Latest Version of macOS?
The latest version of macOS is macOS 10.13 High Sierra, which was released on September 25, 2017. Apple releases a new major version roughly once every year. These upgrades are free, and are available in the Mac App Store.
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