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Apple Computing Products:
macOS - Operating System
Trying to downgrade from Yosemite back to previous OS X using Time Machine....
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<blockquote data-quote="MacInWin" data-source="post: 1624122"><p>You will have to do a clean install of whatever you had before, then use TM to restore your files from that older backup. The reason you can't do what you want to do is that you are booted into Yosemite, so you cannot overwrite the system files with anything older while you are using them as part of the boot. You can try making a bootable usb memory stick and see if TM can then restore that older version to the internal HD, but as long as you are booted from it, you won't be able to overwrite.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1624122"] You will have to do a clean install of whatever you had before, then use TM to restore your files from that older backup. The reason you can't do what you want to do is that you are booted into Yosemite, so you cannot overwrite the system files with anything older while you are using them as part of the boot. You can try making a bootable usb memory stick and see if TM can then restore that older version to the internal HD, but as long as you are booted from it, you won't be able to overwrite. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Trying to downgrade from Yosemite back to previous OS X using Time Machine....
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