In order for you to upgrade to El Capitan with a clean installation of macOS, You need to create a bootable macOS El Capitan USB drive. A bootable installer drive is much more convenient when you’re upgrading a Mac. You can then use an External drive or the secondary volume (USB) to install the macOS using it as a startup disk.
Solved: My Mac uses El Capitan operating system. When I try to open CS4 apps it says install Java Legacy SE6 Runtime File, and where do I find this? This is a special update from Apple which allows the outdated Java 6 to safely run on your Mac.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.
The command-line installation of macOS would come as savvy mainly for the system administrators. You really do not require a bootable installer to upgrade macOS or reinstalling the operating system, It only will be useful when you have multiple computers lying around and you need to download and use the installer each time.
You must also require a USB 3.0 Drive with at least 16 GB of storage and please ensure you have taken a backup of all the files in your USB 3.0 flash drive as this installation will erase and remove all the files from your flash drive.
You can get USB 3.0 from Here
Download macOS XEl Capitan
You can download macOS El Capitan From Here
OR
if you have downloaded already macOS El Capitan directly, then the downloaded macOS itself to the applications folder as an individual app called as “Install macOS El Capitan”. Sometimes it is also possible that the installer opens itself right after downloading it, You need to ensure quitting it without proceeding to go with the installation directly. Also, it is important for you to download the correct version of macOS as per your mac.
How to create a bootable installer for macOS El Capitan
Step 1: Download macOS El Capitan.
Step 2: Once El Capitan is downloaded, You should make sure that you close the installer and Open the finder.
Step 3: In Finder, You need to head over to Application→Install macOS El Capitan right click on install macOS El Capitan and click Show package contents.
Or
If You have downloaded from the link then go to Download→ macOS El Capitan.
Step 4: Head over to open Content→Resources
Step 5: Using Finder another window and Go to Applications and Select Utilities→Terminal
Step 6: Type sudo followed by space
Step 7: Now from the original finder window opened in step 4, drag and drop the createinstallmedia to terminal
Step 8: Type --volume along with space
Step 9: Open Finder and click Go at the top followed by Goto folder menu or by pressing command + shift + g at the same time.
Step 10: Type /Volumes and click go to navigate to the volumes that are connected to your mac
Step 11: You should probably find your connected USB 3.0 Flash drive on your Mac in the Finder window
Step 12: Now Drag the USB 3.0 Flash drive volume to the Terminal window
Step 13: Now press Enter / Return on keyboard
Step 14: Type y so you can continue the progress and Press Enter / Return on the keyboard again.
After the above process, You can also use the USB 3.0 drive to boot into macOS El Capitan installer Once you connect your USB 3.0 flash drive, Then restart your Mac by pressing the Option (⌥) button modestly. Then you may select the macOS El Capitan Installer to get started with the installation.
Java is no longer installed with a OS X 10.11 El Capitan clean install, and you’ll find that after updating a Mac a prior version of JRE may no longer function.
You may come across when trying to use some particular applications or web content, “This application requires the legacy Java SE 6 runtime which is unavailable for this version of OS X.” error message, which means if you want to run that app you’re going to need to use an older version of Java.
If you do not need Java, you should not install Java. Java is, and always has been, the source of many security holes.
Here’s how you can install JRE (Java Runtime Environment).
Step 1. Open Safari and go to the Oracle Java downloads page and download the JRE .tar.gz version. You should end up with a file named something similar to jre-8u65-macosx-x64.tar.gz.
Step 2. Go to your Downloads folder and extract the JRE download or use Terminal to extract files:
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Step 3. Open Terminal
Step 4. Edit the Info.plist file within to enable the JRE to be used from the the command line, and from bundled applications:
Step 5. Move the JRE folder to the correct location:
Type password on prompt.
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Be sure you are in the correct directory (the JRE folder) when you issue this command, because it will move your current directory to /Library/Java/JavaVirtualMachines/!
Step 6. Create a link to add backwards compatibility for some applications made for older Java versions:
You should be done now, so try and open the application. If it does not work, some applications require legacy Java 6 to be installed.
You can have it installed without actually using it, however, it’s possible to trick the applications into thinking legacy Java 6 is installed, without actually doing so.
Step 1.Disable SIP (System Integrity Protection) in OS X El Capitan. Here is tutorial to disable and enable SIP.
Step 2. Trick some applications into thinking that legacy Java 6 is installed by creating two folders with the following commands in Terminal:
Step 3. Don’t forget to enable SIP again after creating these directories.