Then position yourself in the InstallMacOSX.pkg "package" created by the pkgutil command cd ~/Desktop/Installer/InstallMacOSX.pkg Then, from the terminal (Applications/Utilities) un-compact the InstallMacOSX.pkg file in a directory (Installer for example) which will be created by the following pkgutil command: pkgutil -expand ~/Desktop/InstallMacOSX.pkg ~/Desktop/Installer Then open the dmg and copy InstallMacOSX.pkg on the Desktop.
Start by downloading the El Capitan dmg from this link :
Surely there is just an ISO I can get and write without all these hoops?s I assume the real problem is a system incompatibility. When I google this error some results indicate it is due to an expired file, but changing my system date to 2016 does not fix it. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyUSBVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.appīut this yields /Applications/Install OS X El Capitan.app does not appear to be a valid OS installer application. dmg and then ran the terminal command from that support page: I used a utility to extract the Install OS X El Capitan.app file from the. DMG is downloadable directly from the Apple Support page, which provides instructions on how to make a bootable volume, with a major caveat On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg I am running into walls trying to make the stick from my own computer, which is an M1 MacBook Air running Big Sur.Īn El Capitan.
It seems to me next step is to try a bootable USB stick. It won't boot past a spinning progress bar on a grey screen, and will not boot into Recovery Mode or Safe Mode. It is running Snow Leopard but the most recent OS it supports is El Capitan. I am trying to rescue my dad's 2008 iMac.
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