This article is about macOS High Sierra – but the newer versions are working the same way.
Install macOS Extractor. There should be a new drive appearing on your Desktop called ‘Mac OS X Install ESD’. Don’t worry about that. The AutoPatch Tool will unmount that when its done. Go to Applications/OS X Hackers Patch Files and run the AutoPatch package. During the AutoPatch.
- Open the 'macOS High Sierra Patcher' tool, and browse for your copy of the macOS High Sierra Installer App.Ensure that the tool successfully verifies the app. Next, select your USB drive in the Target Volume list, and click 'Start Operation.'
- OS X El Capitan (10.11) on Unsupported Macs macOS Extractor and MacPostFactor are apps that guide you through patching and installing OS X El Capitan (10.11), Yosemite (10.10), Mavericks (10.9),.
- OS X El Capitan (10.11) on Unsupported Macs macOS Extractor and MacPostFactor are apps that guide you through patching and installing OS X El Capitan (10.11), Yosemite (10.10), Mavericks (10.9), or Mountain Lion (10.8) on your older Mac. This thread focuses on OS X El Capitan.
Dosdude Sierra
There is a way to install newer versions of macOS on older unsupported Macs. The tool is called „macOS High Sierra Patcher“ and can be found on this website with instructions:
El Capitan Patcher Tool
Personally, I did it on my Mac Pro ’08 (MacPro3,1), which officially supports only OS X 10.11 „El Capitan“. With the „macOS High Sierra Patcher“ I managed to install the latest macOS (10.13). Now I have Siri and many other new features on this computer. The usage is still very good.