Trying to reloadMountain Lion on an older macbook Pro. Computer wants to verify my eligibility with Apple. After hitting CONTINUE, it comes back with "an error has occurred while preparing the installation. Try running this application again. So I did and same results. Computer is a 2012 Mac Book ProCan't reload
[Re-Titled by Moderator]
Earlier Mac models
Try booting the laptop into Internet Recovery Mode using Command + Option + R to attempt to access the online macOS 10.15 Catalina installer. Unfortunately some Macs may still only boot to the online installer for the version of macOS which originally shipped with the Mac from the factory. Even if it still boots into the online Mountain Lion installer, try installing it anyway since it may not need to authenticate.
Otherwise you will need access to another compatible Mac generally from 2007 to 2019 so you can create a bootable macOS 10.11 or 10.15 USB installer
.
You can confirm OS compatibility with various Apple hardware by using this article:
Try booting the laptop into Internet Recovery Mode using Command + Option + R to attempt to access the online macOS 10.15 Catalina installer. Unfortunately some Macs may still only boot to the online installer for the version of macOS which originally shipped with the Mac from the factory. Even if it still boots into the online Mountain Lion installer, try installing it anyway since it may not need to authenticate.
Otherwise you will need access to another compatible Mac generally from 2007 to 2019 so you can create a bootable macOS 10.11 or 10.15 USB installer
.
You can confirm OS compatibility with various Apple hardware by using this article:
Unable to verify Mac OS X Mountain Lion eligibility when installing on my older MacBook Pro
