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Installing old macOS on your Mac
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README.md

MacOS Release Date

El Capitan

date -u 1001000015

Official Release Date (10.11.0): September 30, 2015

Sierra

date -u 0921000016

Official Release Date (10.12.0): September 20, 2016

High Sierra

date -u 0925000017

Official Release Date (10.13.0): September 25, 2017

Mojave

date -u 0925000018

Official Release Date (10.14.0): September 25, 2018

Tutorial

  1. Boot into your macOS Installer Install

  2. Go to Utilities -> Terminal Terminal

  3. Change your date to MacOS release date Change

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