Installing El Capiton on an old Mac Book Pro today, I received the error:

  1. Mac Os Cannot Be Installed
  2. Macos Could Not Be Installed
  3. Os X Could Not Be Installed No Packages Were Eligible
  4. How To Fix No Packages Were Eligible For Install
  5. Os X Cannot Be Installed

OS X could not be installed on your computer

No packages were eligible for install. Contact the software manufacturer for assistance.

Have you tried installing macOS or OS X and came across an error stating that your OS could not be installed on your computer? Well here's a quick fix! Jun 21, 2016 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. Connect to a wifi or plug in ethernet and download os x (second option I believe.) It will download and then try to install itself and then fail with no packages were eligible message with option to restart. Shut off wifi (top right) or unplug ethernet cord go to utilities -terminal- type this and only this, date. If your macOS Sierra won't install or you face the same problem with other versions, then don't worry. In this guide, we will teach what to do when macOS could not be installed on your computer. Restart and Reinstall Mac. Check Mac Date & Time. Free Up Mac Space. Another method to fix OS X could not be installed on your computer is to update your macOS in Safe Mode. In Safe Mode, your Mac can run under a pure environment without the interruption of hardware failure and startup items. It can also solve some issues on your Mac. How to enter Safe Mode on Mac?

Quit the installer to restart your computer and try again.

Not

I checked Appleā€™s 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.

Mac Os Cannot Be Installed

PackagesOs x could not be installed no packages were eligible

You can easily reset the time and date by following the steps below:

Macos Could Not Be Installed

  • 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

Os X Could Not Be Installed No Packages Were Eligible

Once the Date and time are configured you will be able to install OS X.

How To Fix No Packages Were Eligible For Install

Eligible

Os X Cannot Be Installed

Easy fix, for a ridiculous error!