Q: I get a 'NO' symbol when starting up after successfully installing High Sierra. A: Make sure you have run the post-install patch on the correct volume, as detailed above in steps 8-10. Q: I get a 'NO' symbol when starting up from the patched USB drive A: Check the supported/not supported list at the top of this page. In macOS 10.13 High Sierra, a significant feature called System Integrity Protection (SIP) was introduced and enhanced, which prevents malware from modifying protected files and folders on Mac. SIP also intervenes when third-party safe apps are trying to gain access to system disk or partition. Date Format Key: YYYY — The year (the first two digits/century can be omitted). MM — The month of the year, from 1 to 12. DD — The day of the month, from 1 to 31. Hh — The hour of the day, from 0 to 23. Mm — The minute of the hour, from 0 to 59. Go to answer for Mac OS High Sierra and newer. Go to answer for Mac OS El Capitan and older. No, not really anyone can use Mojave, for exemple, anyone who have a Mac prior to 2012 (except 2010 Mac Pro with a Metal compatible GPU) can’t run Mojave, or Hackintosh user (like me, on a old Core 2 Duo) But it’s true that the High Sierra Dark Mode is not very good.

No Date In Finder For Mac High Sierra Version
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18 Apr 2021

macOS version 10.13.0, called 'High Sierra,' was released on 2017-09-25. It is a free update to 10.12 Sierra. An update page with an installer link is at https://support.apple.com/en-us/HT208969. This note describes how to update a computer from an older version of macOS to OS X 10.13 High Sierra.

The latest version of macOS is version 11.0.1, 'Big Sur', released on 12 Nov 2020.

Apple released MacOS 10.13 Supplemental Update on 05 Oct 2017, fixing a security bug.
Apple released MacOS 10.13.1 on 31 Oct 2017, fixing security bugs including the KRACK vulnerability.
Apple released Security Update 2017-001 v10.13 on 29 Nov 2017, fixing the 'root login' bug.
Apple released Security Update 2017-001 v10.13.1 on 29 Nov 2017, fixing the 'root login' bug. That fix broke file sharing between Macs; Apple has documented a fix to the fix, and re-released Security Update 2017-001 v10.13.1 with the fix.
Apple released MacOS 10.13.2 on 06 Dec 2017, fixing the 'root login' bug again, as well as other security problems.
Apple released macOS High Sierra 10.13.2 Supplemental Update on 08 Jan 2018, to mitigate the effects of the 'Spectre' bug.
Apple released MacOS 10.13.3 on 23 Jan 2018, fixing a few bugs.
Apple released macOS High Sierra 10.13.3 Supplemental Update on 20 Feb 2018 fixing the Telugu crasher bug.
Apple released macOS High Sierra 10.13.4 on 29 Mar 2018, fixing a few bugs. Problems with multi-monitor configurations have been reported.
Apple released macOS Security Update 2018-001 on 24 Apr 2018, fixing three security bugs.
Apple released macOS High Sierra 10.13.5 on 01 Jun 2018, fixing a few bugs.
Apple released >macOS High Sierra 10.13.6 on 09 Jul 2018, fixing security bugs and updating device firmware.
Apple released Security Update 2018-002 for High Sierra on 30 Oct 2018, fixing security bugs.
Apple released Security Update 2018-003 for High Sierra on 05 Dec 2018, fixing security bugs.
Apple released Security Update 2019-001 for High Sierra on 22 Jan 2019, fixing security bugs.
Apple released Security Update 2019-002 for High Sierra on 29 Mar 2019, fixing security bugs.
Apple released Security Update 2019-003 for High Sierra on 13 May 2019, fixing security bugs.
Apple released Security Update 2019-004 for High Sierra on 22 Jul 2019, fixing security bugs.
Apple released Security Update 2019-005 for High Sierra on 26 Sep 2019, fixing a serious security bug.
Apple released Security Update 2019-006 for High Sierra on 29 Oct 2019, fixing serious security bugs.
Apple released Security Update 2019-007 for High Sierra on 11 Dec 2019, fixing serious security bugs.
Apple released Security Update 2020-001 for High Sierra on 28 Jan 2020, fixing serious security bugs.
Apple released Security Update 2020-002 for High Sierra on 24 Mar 2020, fixing security bugs.
Apple released Security Update 2020-003 for High Sierra on 01 Jun 2020, fixing security bugs.
Apple released Security Update 2020-004 for High Sierra on 15 Jul 2020, fixing security bugs.
Apple released Security Update 2020-005 for High Sierra on 24 Sep 2020, fixing security bugs.

I installed High Sierra on three computers. Two have moved on to Mojave; my Mac Mini is so old that it is stuck on High Sierra.

New Features of High Sierra

There is a new file system, called APFS. Installing High Sierra will reformat your storage if your machine has an SSD. This new file system has caused problems with some applications.

New graphic and video formats are supported, which will make smaller files.

Mail, Photos, Siri, and Safari have new interface features.

Should I Install High Sierra?

If your computer is working now, there is no urgent need to change your OS, until you want the new features, or continuing security updates.
Apple usually supports the current version and the previous version. Using an unsupported OS will still work, but if security problems are found in an unsupported version, Apple usually does not patch them.
Eventually, companies will write software that requires features of the latest Apple OS, and someday you may want to buy and use some of that software.
If your current Macintosh fails and you have to buy a new one, you'll end up migrating to High Sierra whether you were ready or not. This happened to me.

Show Stoppers

Check MacInTouch for the latest status.

Installation Problems

Some users whose disk is encrypted with FileVault report that their attempt to install will not accept their unlock password. (Thanks to Marv Schaefer for this tip.)
Another friend attempted to install High Sierra and ended up in a panic/reboot loop. It took many hours of Internet recovery to complete installation.

Users who have Fusion drives are having problems installing the system. APFS support is apparently incomplete.

A MacInTouch reader reported problems upgrading; when they finally got High Sierra installed, all their mail messages were missing, and application license data was lost.

Some users report that their attempt to install fails with the message 'macOS could not be installed on your computer' halfway through. Make sure you clone your hard disk before you start installing. Some users had trouble installing the Supplemental Update.

Migration Problems

I bought a new computer for a family member. The machine came with High Sierra. I used Migration Assistant to move files and settings from the old computer that was running El Capitan. Multiple problems ensued.

Trying to open some Adobe programs popped up an alert window that I needed to install the Legacy version of Java -- as expected. I clicked the 'More Info' button, which took me to a download page, and downloaded the software. Trying to open the .dmg file resulted in the alert 'the file is damaged and will not open.' I had to use Terminal to execute the command cd ~/Downloads; sudo xattr -d -r com.apple.quarantine *.dmg. Then I could open files and install Java.
It turned out that many files were marked with the 'quarantine' xattr and would not open. Subsequent file downloads and newly created files were all marked 'quarantine.' I finally did defaults write com.apple.LaunchServices LSQuarantine -bool NO to prevent further nonsense. Apple support was no help. They suggested rebooting, zapping the PRAM and resetting the SMC. I did more investigation and found that it's not the presence of the 'quarantine' xattr, but rather the specific bits in its value; deleting the quarantine attributes was not necessary. I have not figured out whether the wrong bits were on in the attribute, or if the quarantine checkeer was alarming incorrectly. For the moment I have left LSQuarantine turned off.
Several people in the MacInTouch forums suggested: do not use Migration Assistant to transfer applications.
iTunes would not work.

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