Q: Having trouble installing OS X El Capitan

Did you try stopping and restarting App Store ?

Yes. Quit App Store and restarted. No effect. Shut machine down and restarted. Went to App Store.  No effect. Got courageous and double-clicked on Install OS X to take the risk. Got the same error message. Here it is, exactly: "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." Will try that next. Hold your breath.

Are they nuts? Deleted Install app and emptied trash. Went to Purchases page of App Store (as directed) and it still says "Downloaded" (greyed out). Clicked on El Capitan icon, was taken to a different page, and clicked on Download (at last available). Now getting the old spinning dial (not the beach ball), without any progress bar. Guess I will just let it spin for hours. I'll stop pestering you folks unless I find a solution. Thanks again for all the ideas.

Macworld has a decent guide ... people are probably having network issues, could be on Apple's side but hard to tell.

http://www.macworld.com/article/2986158/operating-systems/how-to-install-os-x-el -capitan.html

I would try to shut down and restart first, and see if it will boot up in el capitan.

Sorry, Mr. Brent. Done that. Multiple times. Still in Yosemite. But thanks. I do appreciate the efforts.

Downloaded and installed El Capitan with no problems to my iMac, using same wifi and router as for the new MacBook, where install failed. Wondering if there's something peculiar to the 2015 MacBook.

Have the same issue while trying to install. Some sites suggest to set the date correctly, but that does not seem to be working in my case.

Any solutions ?

My MacBook Air stuck on Terms and Conditions page. It would not go forward or backward. Any solution?

I've had that same problem (not on this upgrade) when my trackpad was not responding correctly, did you try clicking the button using an external mouse ?

I am also having this exact problem. I've tried downloading the installer from the App Store twice and both this have gotten this same error.

Target machine is is a MacBook Pro 13-Retina, Early 2013 with OSX 10.10.5

I wonder what is going in and how long it will take Apple to fix.

-J

Same problem. 2011 i5 Mini running OS 10.10.5. The installer launches, eats up all my available RAM (of which there are several gigabytes), then tells me it can't be verified and to delete the installer. I have to restart at that point because my trackpad gets glitchy after that.

Downloaded from the App Store and having the same problem.

MacbookPro early 2015

Re: Having trouble installing OS X El Capitan

I had the same This copy of the Install OS X El Capitan application can't be verified

I found this solution online,

It looks like the date/time of the machine is not OK.

You can check it easily by simple type "date" in the terminal (mine showed an old date)

You should update it from the terminal like that:

date 1002173315

Where:

10 is the month

02 is the day

08 is the hour (5pm)

33 is the minute

15 is the year (2015)

Solution found on http://osxdaily.com/2015/01/19/fix-os-x-install-errors-cant-be-verified-error-oc curred-preparing-mac/

Hope that help someone...