Many of us should be prompted now about this new update from Apple. I was looking forward to it as I occasionally have an issue with my Apple Watch unlocking my work MBA and supposedly it is fixed in this release. You can learn more about what is in it via this third – party (Macworld) article. It looks like some improvements / fixes for Microsoft Office too which is good.
I have updated one MacBook Air with no issues. Of course I always suggest a full Time Machine backup as well as an image backup with something like SuperDuper.
Links
Info about this update – https://support.apple.com/en-ca/HT206174
Security info on this update – https://support.apple.com/en-ca/HT207275
More third party info (Tidbits) – http://tidbits.com/article/16853
Michael
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Notes from MWhite 