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Not needed
- As long as the "OS X El Capitan.app" is complete and there is no corruption, then it should be usable to make a USB installer. The.dmg file is not needed once the installer app is in the Applications folder.
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Do I need a dmg file to install El Capitan?
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Sep 16, 2024 · These older macOS versions are available as disk images that you can download using your web browser. To get the installer from the disk image, you must use a Mac that is compatible with that macOS. Use these links to download a macOS disk image (.dmg) file.
Sep 16, 2024 · Make sure that the installer is named Install [Version Name], such as Install macOS Sequoia. It must be an installer app, not a disk image (.dmg) or package (.pkg) that contains the installer. Connect a USB flash drive to your Mac. Connect a USB flash drive or other secondary volume to your Mac.
Sep 6, 2020 · The .dmg file is not needed once the installer app is in the Applications folder. As @Eau Rouge mentions if you are downloading the El Capitan .dmg installer file there are several steps which must be done before the installer shows up in the Applications folder.
- Here is the official Apple article on how to create a bootable macOS USB installer: https://support.apple.com/en-us/HT201372 You can use a bootable...
- You downloaded the correct full installer contained in the InstallMacOSX.dmg. When you open that to the InstallMacOSX.pkg you then open that and yo...
- @Eau Thank you, I poked around the 'net after posting here and found instructions on: creatinstallmedia via Terminal So shall use that to have on a...
- @HW Thank you. InstallMacOSX.dmg does not reside on the computer that has Install OS X El Capitan.app within it's application folder. Can I assume...
- As long as the "OS X El Capitan.app" is complete and there is no corruption, then it should be usable to make a USB installer. The .dmg file is not...
- Installer should be ok, just checked it is 6GB+ Plan to put on an external HD partition. Many Thanks too ALL
- I have given you the full instructions above, have you read them.
- Rename the USB Flash Drive to Become the OS X El Capitan Bootable Installer: The next thing you’ll want to do is rename the target volume that you wish to turn into a bootable installer drive, in this case an external USB flash drive.
- Make the OS X El Capitan Bootable Installer Drive with a Terminal Command: Launch the Terminal application, found in /Applications/Utilities/ and enter the following command exactly (unless you changed the target volume name from ElCapInstaller to something else) onto a single line, the text will wrap because it is long, but it’s important to have proper syntax:
An InstallMacOSX.dmg file for OS X El Capitan, can be downloaded from the Apple website How to download macOS. While this file can be restored to a flash drive, the result is not a working OS X El Capitan USB installer. The same is true for the macOS Sierra file InstallOS.dmg file, which can be downloaded from the same Apple website.
Jan 9, 2024 · The only guides for creating a bootable drive to install El Capitan require me to have a Mac that supports El Capitan in order to convert the "Install OS X El Capitan.dmg" file to a "Install OS X El Capitan.app" file.
Apr 26, 2021 · You need a copy of the El Capitan installer to make a bootable USB. The El Capitan installer is downloaded to the /Applications folder, with the file name "Install OS X El Capitan." If you've installed El Capitan and want to create a bootable installer, re-download the installer from Apple.
