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I had an issue with El Capitan beta 3 which prevented Mail working. I noticed that if I checked via 'About' it did not even say El Capitan was the OS. I dexited therefore to reinstall adopting the method above. Very easy way to reinstall Mac if you are thinking about selling your computer or simply need to install a fresh copy OS X El Capitan follow the tutorial to.
- Reinstall El Capitan on a computer alreadyrunning it
Upgrade from previous versions to OS X 10.11 (El Capitan)
- From the Apple menu, select App Store....
- When the App Store opens, search for and download El Capitan. If you don't already have an Apple ID, you'll need to create one. You can monitor the download process in the 'Purchased' section of the App Store.
- Once the download is complete, the installer should automatically open.
If it doesn't, or you don't want to complete the installation at this time, you can come back later and double-click Install OS X El Capitan in your Applications
folder.
Within the installer, click Continue, agree to the license agreement, and then choose the disk where you want to install El Capitan.
After you begin the installation, your computer may need to restart more than once before finishing, and then you may be asked to enter basic information.
- From the Apple menu, select App Store..., and then install any available updates.
El Capitan Iso File
Reinstall El Capitan on a computer already running it
El Capitan Download
To reinstall or recover El Capitan, you must have an active internet connection. If you are on campus at IU, UITS recommends the wired Ethernet network instead of wireless. However, if IUSecure is your only option, see Connect to an IU wireless network in macOS if booted from your Recovery HD.
Reinstall while keeping files, applications, and settings
- Restart your computer, and immediately hold down
command-r
until the gray Apple logo appears. - If prompted, select your main language and then click the arrow.
- Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
- When the installation is complete, select App Store... from the Apple menu, and install any available updates.
Reinstall while erasing everything on your computer
Restart your computer, and immediately hold down command-r
until the gray Apple logo appears.
- If you see a screen asking you to select your main language, choose it, and then click the arrow.
- Click Disk Utility, and then Continue.
- In Disk Utility:
- Click your hard disk in the left column, and then click the Erase tab.
- Next to 'Format:', make sure OS X Extended (Journaled) is selected. In the 'Name:' field, give your disk a name. Click Erase.
- Once it's completed, quit Disk Utility.
- Click Reinstall OS X, and then Continue:
- Follow the instructions on the screen, and then choose your hard disk.
- Click Install. If prompted, enter your Apple ID information.
- Once the installation is complete, you'll be asked to enter basic information, and have the option to transfer data from another computer or backup.
- From the Apple menu, select App Store, and then install any available updates.
Installing El Capiton on an old Mac Book Pro today, I received the error:
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.
I checked Appleās support Matrix (it is a very old macbook pro) at https://support.apple.com/kb/SP728?locale=en_GB and it was listed as supported.
After lots of Googling and investigation, I discovered that the date and time were not set to current, the macbook thought it was year 2000.
You can easily reset the time and date by following the steps below:
No Disk To Select For Reinstall El Capitan
- Click Utilities on the menu bar
- Select Terminal
- Type date
- Confirm the date is wrong
- Type date 062112422016 (example: June 21st 12:42 2016)
- Exit terminal
- Click Restart
Once the Date and time are configured you will be able to install OS X.
Reinstall El Capitan Without Losing Data
Easy fix, for a ridiculous error!