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Just go through the process and at the end it will create another application file in your Applications folder called "Install macOS Sierra" and this version is NOT expired (if you check the file info you should see it's a more recent version than the one from the App Store). This will start an installer process, but don't worry, it is NOT going to install on the machine you're working on now. So, when it is downloaded open it and then open the InstallOS.pkg file that is inside it. This will take a while, it's a 5Gb file.ĥ) This version downloads as a disk image called InstallOS.dmg, not an app for some reason. You shouldn't need it again and can delete it later, but keep it for now just in case.Ĥ) Download the other, newer version of Sierra that Apple offer from their website under Step 4 here. Follow the instructions on Apple's website here under "Use the 'createinstallmedia' command in Terminal" to do this.ģ) Rename the app file in your Applications folder from "Install macOS Sierra" to something else, such as "Install macOS Sierra - expired", you'll need admin password to do this. Only Apple know why they have left an expired product on their App Store.Ģ) Don't worry about it being expired, run the command on Terminal to create a bootable USB drive with it anyhow. However, when the download completes you will get an error message saying it is damaged and can't be used, this is because the certificate has expired and so your computer thinks it is out of date. It will download an application file to your Applications folder called "Install macOS Sierra". This will take a while to download, it's a 5Gb file. I've written some step-by-step instructions for the process which I hope are helpful for anyone that doesn't want to read through the whole context to Prometeus's version:ġ) Download Sierra from the App Store using this link. Took me a long time to work this out but Prometeus's second solution on worked for me in the end and seems like the most elegant work round that uses the most recent files, if you want a clean install. not sure, may be High Sierra too.Īnd don't forget, you can always install macOS which was shipped with your Mac from the Internet. It is not available from Mojave, Catalina. Old installer is still available in Mac App Store. and ready to boot from new Sierra installer with new certificate. Copy new "Install macOS Sierra.app" to the USB drive you created before (step 2.3)Ģ.7. Then use InstallOS.dmg (new installer) to install new "Install macOS Sierra.app" in you Application folder. When you finish, delete "Install macOS Sierra.app" from USB drive and from the trash bin at all! It's important! It looks like empty USB, but it is NOT!Ģ.5. Use old installer to create USB-installer according to this article: Ģ.4. Make backup of this two files (zip them all and save to another place).Ģ.3. You need the old install (because in new one the execution file of createinstallmedia is not works. If you want new USB installer for macOS with new certificate you need to do more steps:Ģ.1. It will set the system date before the certificate expiration date. Open Terminal from Utility menu and run this command: when you boot from usb-drive, don't click to install macOS. Use old one "Install macOS Sierra.app", but!. To get bootable Sierra Installer you can:ġ.