Hello: I ran into a problem on an imac. Was running Yosemite. I wanted to install Mojave but couldn't til I installed El Capitan or other OS. Got a message that packages were no longer available. Could you please tell me what date to set the clock back to make this work? Thank you Evidently, I can't even start the imac from Yosemite any more. Oct 01, 2015 Go to the Applications folder. Open the program called 'Install OS X El Capitan'. Follow the on-screen instructions. If this program is missing or will not run, then move it to the trash and empty the trash, followed by re-downloading it from the App Store. An alternative approach is to create a dedicated installation drive from the El.
OS X could not be installed on your computer.
No packages were eligible for install. Contact the software manufacturer for assistance.
Quit the installer to restart your computer and try again
Oh dear… When trying to install OS X 10.11 (El Capitan) you may encounter this message. This happens because the the installer certificates are no longer valid when checked against the clock of your mac.
Western digital drivers for mac. Don't panic though as this is easily fixed using Terminal, so don't restart immediately.
- Click Utilities on the menu bar
- Select Terminal
- Type date 062112422016
- Exit Terminal
- Click Restart
When you restart the mac and try the installer again it will now believe the certificates are valid and will continue as it should.
To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier.
El Capitan Could Not Be Installed In China
If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, it might say that it's not compatible with this device or is too old to be opened on this version of macOS. To confirm compatibility before downloading, check the minimum hardware requirements:
- Click Utilities on the menu bar
- Select Terminal
- Type date 062112422016
- Exit Terminal
- Click Restart
When you restart the mac and try the installer again it will now believe the certificates are valid and will continue as it should.
To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier.
El Capitan Could Not Be Installed In China
If a macOS can't be used on your Mac, the App Store or installer will let you know. For example, it might say that it's not compatible with this device or is too old to be opened on this version of macOS. To confirm compatibility before downloading, check the minimum hardware requirements:
- macOS Catalina 10.15 hardware requirements
- macOS Mojave 10.14 hardware requirements
- macOS High Sierra 10.13 hardware requirements
- macOS Sierra 10.12 hardware requirements
- OS X El Capitan 10.11 hardware requirements
- OS X Yosemite 10.10 hardware requirements
Download macOS using Safari on your Mac
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.
- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
El Capitan Could Not Find Installation Information For This Machine
Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.
El Capitan Could Not Be Installed
- macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
- OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
- OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard
