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I'm trying to update my iMac to OS X 10.10.5, but there seems to be an error when updating.

When I press the update button a message appears to download and restart. When I press it the update starts to install. After some time it get blocked or a message 'show details' is shown, but even after pressing it nothing happens. The update still remains in the App Store.

How can I complete the update?

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Assuming you are already on 10.10.something just get the Combo Updater directly from Apple, rather than from the App Store.

Direct link: Download OS X Yosemite 10.10.5 Combo Update

  • Hmm I recommend to first boot to Recovery HD and check the main volume for errors (and repair them if needed) and then update with the Combo installer. – klanomath Dec 24 '15 at 10:51
  • Very sensible suggestion - I was just going for easy rather than thorough as a start point, as we're not really sure what the error was, or indeed what the current OS is. – Tetsujin Dec 24 '15 at 10:56

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