![]() I don't know why either, maybe there was a problem updating the firmware. Step 10: In the window, select the model of your Mac. Click macOS Post Install in the side menu or the drop-down menu in Utilities. In order to successfully install High Sierra onto your Mac then you need to ensure that you have at least 8GB of free space available on your Mac’s hard drive. Mac OS Sierra features many new capabilities for Apple devices. Step 9: Let the installation finish, and once it is completed, reboot back into the installer drive (same as Step 5). Download the latest version of macOS Sierra for free. There may have been another way, but I couldn't figure it out. Select where you want to install macOS and click Continue. I then had to open the iMac again, swap the SSD for the HDD again, and then I could do a fresh install. Download the High Sierra macOS installer as described in the Download macOS section above. The Mac App Store will be your main way to download macOS. Choose the volume you wish to install the new macOS on and click Erase. To install High Sierra on the third-party SSD, I had to open the iMac again, put an OEM Apple HDD back, install an OS before high Sierra, then upgrade to High Sierra, installing the Firmware in the process. Here is a definitive guide on how to install macOS High Sierra on a non-startup drive: 1. Essentially what this is doing is ditching your old wireless preferences and causing MacOS High Sierra to. Return to the Wi-Fi menu in the upper right corner and choose Turn Wi-Fi On, and then join the wireless network as usual. After it downloads, launch the installer and follow its instructions. I forget the exact message, or if there even was one, but I think I wasn't even able to start the install process because the SSD showed as greyed out on the installer when picking the installation drive. Restart the Mac by going to the Apple menu and choosing Restart, then let the Mac boot up as usual. The issue appeared when I went to do a clean install of High Sierra on the new SSD. I swapped with a third-party SSD and cloned the OS from another Mac I had and was running High Sierra on it just fine. The reason why is because I pulled a failing HDD from the Mac that only had Yosemite installed. I could install earlier OS versions, but not High Sierra. The macOS High Sierra 10.13.6 Update adds AirPlay 2 multiroom audio support for iTunes and improves the stability and security of your Mac. Enter: sudo /Applications/Install macOS High Sierra.app/Contents. ![]() In the Utilities folder, open the Terminal. I have personally had a firmware issue on an iMac that prevented me from installing High Sierra to an non-Apple SSD. For the purposes of this tip, in the Finder name the external drive macinstall. Click to expand.I don't know why either, maybe there was a problem updating the firmware. Here is how to get an older version of Mac OS X from the Mac App Store (this only works if you’ve downloaded it in the past and it won’t work if you have already installed Mojave or later.
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