OS X 10.11 El Capitan Upgrade

[danny_hanes]

Attempting to install 10.11 El Capitan and I follow the instructions found here however when I start to go through the install process I get the following error message. Any thoughts?

This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading. Delete this copy of the application, and go to the Purchases page of the Mac App Store to download a new copy.

[roiegat]

Is this happening on multiple machines or just one? Sounds like you might have a bad download...or permission issues.

I would add a line before trying to run it to repair the permissions first. I find that helps more often then not.

[danny_hanes]

Looks like 3rd time is the charm. Not sure what was going on. I tried downloading it twice and it failed. Seems to be resolved for now.

[guidotti]

I've seen that before when the download was interrupted at some point and resumed. The hash check probably fails.