Is the copy of El Capitan you are retrying to install an old copy you downloaded some time ago.

• Download Java Mac Os X El Capitan 10 12
• Os X El Capitan 10.12
• Java For Os X

Oct 09, 2017 This is a special update from Apple which allows the outdated Java 6 to safely run on your Mac. In the release notes for the Java 6 update, Apple states: Java for OS X 2015-001 installs the legacy Java 6 runtime for OS X 10.11 El Capitan, OS X 10.10 Yosemite, OS X 10.9 Mavericks, OS X 10.8 Mountain Lion, and OS X 10.7 Lion. Download OS X El Capitan For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS. If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.

Recently the certificates for certain Mac OS's expired making it difficult or impossible to install them.

Apple released updated versions with new valid certificates, so you could try downloading the updated

release of El Capitan, from here. How to upgrade to OS X El Capitan – Apple Support

Please note there are different instructions, read Sections 4 to 7 completely.

At Section 4 you click on Download OS X El Capitan, this will download Install MACOSX.dmg.

Double-click on Install MACOSX.dmg and you will then get Install MACOSX.pkg.

Double click on that and an installation window will open, this does not install El Capitan but converts

Mac os sierra download on windows pc. Install MACOSX.pkg to Install OS X El Capitan.app which will be in your Application folder.

Use that to install El Capitan.

Dec 1, 2019 11:17 PM

Check compatibility

You can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.

MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009

To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X El Capitan, the installer will let you know.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download OS X El Capitan

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.

If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.

Install the macOS installer

Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.

Follow the onscreen instructions, which will guide you through the steps necessary to install.

Download Java Mac Os X El Capitan 10 12

Begin installation

After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan.

Os X El Capitan 10.12

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.

Java For Os X

Learn more

• OS X El Capitan won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
• You can use macOS Recovery to reinstall macOS.