"The OS X Installation couldn't be completed"

I'm also experiencing this issue with my MacBook Air. (Mid 2011) I tried to update from OS X lion 10.7 to El Capitan. I tried it five times and the same result! I even put into recovery mode and I get the SAME result EVERYTIME!! 😢 PLEASE HELP!!!

I have the same problem. iMac 27 inch, mid-2011.

Originally tried updating from the App Store. Got the same message.

Tried restarting and tried installing again, same message. This happened 2 more times.

Next, I started up in OS X Recovery and tried restoring OS X from previous Time Machine backup. When all said and done, it froze on the startup screen with the Apple logo and status bar at halfway point.

I even left this overnight thinking it was just really slow, but no progress. Tried this twice.

Finally, rebooted again from OS X Recovery and tried to reinstall Mac OS X as new (with the intent of later on restoring from Time Machine backup). I thought I had some progress as it actually gave me a time estimate below the progress bar. But then after the progress bar completes and it seems to restart again, I get that first message with the error log and option to save.

Any ideas?

I tried creating a bootable installer drive on a USB - and still I came up with the same exact error message. 😟

I really don't want to have to bring in the iMac to the Genius Bar as its out of warranty.

Has anyone tried updating to El Capitan since the new update was released (OS X 10.11.1)? The release notes say improved installation stability but I'm a little scared to even try given my experience trying to install 10.11.0.

Hi everyone,

I had the same issue and unfortunately I didn't have any backup of my system.

I found that my data were still on the disc and solved my problem as follows:

- I have build a bootable drive from OS X installer with DiskMaker X on an other Mac

- I started on this USB key (holding "alt" at startup) and I launched the disk utility on my broken Mac.

- In Disk Utility I add a new partition while keeping the old one.

- I installed OS X on this new partition and putted the same credentials for the admin account as the old one

- I launched OS X on my new partition and I could see my old partition from my new Admin Account

- I launched the Terminal application

- I used The Following Terminal command:

sudo chown -R username:staff /Users/username/

Where username is the short name of the new user account, admin is the short name of the new user's primary group, and /Users/username/ is the path to the user's home directory on the old partition.

- Now you can copy your data to your new partition.

- Once you are sure to have all your data recovered, you can erase your old partition to make a Data partition.

Restore OS X using OS X Recovery.

Then upgrade to El Capitan.

I had the same issue with a 2011 Mac Mini and on a 2009 MacBook Pro, the easiest way was to create a bootable USB stick and do a clean install.

SAme problem . I tried 5-6 times same log appears . I tried from bootable usb even .

IF any found solution please help me out .