Dear Friends,
El Capitan Reinstall
I just got the following message, macOS could not be installed on your computer, while trying to install macOS High Sierra. In both cases there was the same cause. In the El Capitan case, as I say in the next paragraph, the hardware clock had reset to zero because it did not have a battery pack.
I am unable to install OS X El Capitan on my MacBook Pro running 10.6.8. I downloaded the OS X El Capitan from App Store and when I follow the installation instructions, I get this error 'This disk cannot be used to start up your computer'.
I referenced the details mentioned here: https://support.apple.com/en-us/HT203482 (Installer reports 'OS X could not be installed on your computer' or 'This disk cannot be used to start up your computer'), and the problem I am having is that I don't have a Partition on my hard disk. Unfortunately, I do not have a 'startup disk' either and thus I am not sure how to go about installing OS X El Capitan at this time. The instructions says 'If possible, back up and reformat the target disk before installing'.
- Jul 08, 2020 El Capitan probably needs the most prep steps of any OS X system install. Specific steps for El Capitan in that support article, and you have to change your system clock before you begin the install of El Capitan. Boot to the Installer, at the menu screen, open the terminal, enter date, then press enter.
- Please watch version 2 of this video here: the 'install failed' and 'No packages were eligible for install'.
I do have External Hard disk that I can use to create a backup using Time Machine, but I don't know what to do after that. Should I also copy the OS X El Capitan installation file that currently exists on my Mac Internal Hard Drive on the External Hard Disk? What should I do after I create backup on external hard drive? I have lot of data and software on my Mac and don't want to lose them all in the process of formatting the internal hard drive.
I am complete n00b with the upgrade and need assistance.
Many thanks!!!
Mac Os El Capitan Install
MacBook Pro, Mac OS X (10.6.8)
El Capitan Unable To Install
El Capitan Could Not Be Installed On Your Computer
Posted on May 19, 2016 8:52 PM