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If you installed High Sierra on a Mac older than 2009 (MacBook 5,2 or iMac 7,1), you need post-install patches for Wi-Fi, graphics, and USB. Use the tool from DosDude1 – run the patcher from the USB after the main install.
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Click the tab and locate macOS High Sierra 10.13.6 .
hdiutil attach /tmp/HighSierra.dmg -sbinwrite -mountpoint /Volumes/HighSierra Use code with caution. Use the Apple installer tool to populate the image: macos high sierra download dmg install
Detach the volume and move the finalized DMG file to your desktop. Step 3: Create a Bootable USB Installer
Install the app, launch it, and grant it in your Mac's System Settings when prompted. Click on the Installers tab inside Mist. Find macOS High Sierra 10.13.6 in the catalog.
To resolve this issue, disconnect your Mac from the internet before running the installer. Then manually change the system date to a date when the High Sierra installer certificate was still valid (such as 2019 or 2020). After changing the date, run the installer again. Once installation is complete, you can reconnect to the internet and set the date back to automatic. This workaround bypasses the certificate check and allows the installation to proceed. If you installed High Sierra on a Mac
Once you have prepared your installer, you have two main installation paths: a direct upgrade from within your current macOS or a clean installation using the bootable USB.
Here are some frequent problems and their solutions when working with this older OS.
If you have a DMG file (e.g., HighSierra.dmg ), double-click it to mount, then drag the .app to your Applications folder. This suggests a comprehensive guide on downloading and
macOS High Sierra supports the following Mac models:
The macOS High Sierra (version 10.13) operating system continues to serve an important purpose in the Apple ecosystem, particularly for users of older Mac models that cannot run newer systems like macOS Catalina, Big Sur, or later versions. Released in 2017, High Sierra represented a significant transitional release that introduced the new Apple File System (APFS), Metal 2 graphics technology, and numerous under-the-hood improvements that have stood the test of time.
To clean install High Sierra on a formatted Mac, you need a USB drive with at least 16GB of storage. Plug in your USB flash drive.