Install older OS X onto an external drive. The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. Enter your Apple ID. Mac OS users who want to install OS X 10.10 Yosemite on their machines and are facing issues installing the operating system for the first time on their Macs can follow a simple step-by-step guide.

Hi all

I am trying to reinstall OS X Yosemite onto a MacBook Pro Late 2008 version. We are selling the Mac, and have conducted the steps described in 'What to do before selling or giving away your Mac', i.e. deauthorizing from iTunes etc, and erasing all data from the harddrive. I am using an ethernet connection.

When trying to install Yosemite, after entering my Apple ID and password, I keep getting the message 'This item is temporarily unavailable'.

Reinstall Os X Yosemite App Store Temporarily Unavailable

I found members stating that this can be due to the App Store being flooded with requests, but this has been going on for three days now, and I find that a bit unusal.. Especially since the first installation onto our old Mac took one evening..

Verification Os X Yosemite

Thank you all for any help and advice you can provide!

B

How To Reinstall Os X Yosemite

MacBook Pro, OS X Yosemite (10.10), MacBook Pro Late 2008

Reinstall Os X Yosemite

Posted on Nov 7, 2014 10:58 AM