If you ever get this error while attempting to install OS X, you will likely need to set the date using terminal.

• El Capitan No Packages Were Eligible For Install Os X
• No Packages Were Eligible For Install El Capitan Hackintosh

Jun 21, 2016 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. See the latest version of this video here:2 of my tutorial on how to overcome El Capitan's hidden expiry d. I'm running into this problem too. I have spent all morning trying to get a Catalina Mac Mini to run a VM of El Capitan so that I can still use some of my old 32bit software. I keep running into this: 'OS X could not be installed on your computer. No packages were eligible for install'.

The simplest way to set it (if you have no OS installed on the machine) is to boot the install media, open the terminal and check the date (type date).
The following information was found on someones site (sorry I forget which), but I have included it here to make it easier to correct this issue.

El Capitan No Packages Were Eligible For Install Os X

Use the following command in terminal to set the machine to a time and date of your choosing:
date {month}{day}{hour}{minute}{year}
For example, to set it to 8pm on the 2nd October 2018
date 100220002018
The command below will output the current date in a format suitable for use on another machine:
date '+%m%d%H%M%Y.%S'
Further, the following (mouthful of a command) will let you specify a date and time in a more readable format and set it in one go:
date -f '%Y-%m-%d %H:%M:%S' '2016-07-09 15:20:10'

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.

No Packages Were Eligible For Install El Capitan Hackintosh

I checked Apple’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.

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

• 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.

Easy fix, for a ridiculous error!