Yesterday, I downloaded the upgrade to El Capitan in a Mac Pro (early 2008) running Yosemite 10.10.5, and today I can not start the upgrade

Yesterday, I downloaded the upgrade to El Capitan in a Mac Pro (early 2008) running Yosemite 10.10.5, and today I can not start the upgrade.

The only option I have found is to click again on the download button, but the circle of download rest bike for a long time and ultimately that nothing happens.

See if that helps...

Start with CMD + r or the Option/alt key to boot from the recovery partition & use utility disk from there to repair the disk, and then repair permissions.

Tags: Mac OS & System Software

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