Jul 22, 2021 Once this is done, you have successfully installed OS X El Capitan. Method 3: Upgrade through Safe Mode. Finally, if the above solutions do not work out for you, what you can do is download and install the operating system in macOS Safe Mode. This is only for the users that are trying to upgrade from their current version to El Capitan. If you cannot install Office 365, you could contact Apple Official Support to change the version of your MAC. By the way, this tag is for Exchange online server side, if you have more question about Office 365 client, you could post new question with office-itpro tag。.
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 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.
El Capitan Could Not Be Installed Inside
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.
El Capitan Reinstall
El Capitan Could Not Be Installed In One
Easy fix, for a ridiculous error!