In that case, I would suggest you backup your data, erase the drive, then reinstall from scratch.

• Even if you did a clean install of El Capitan it would not explain why you are seeing OS X 10.6.8. OS X 10.6.3/4 was the original system on your computer. Still, it’s hard to know where the 10.6.8 came from, unless Time Machine has been disabled or disconnected for the last 8 years or so.
• Was trying to instal el capitan on my macbook, the installation starts and after a few minutes stops and a messaging saying the os x could'nt be install on the computer, please contact the software editor to get help. I called apple and they said they can't give me any tech support, i guess cause my computer is too 'old'.

El Capitan Os X Download

First, the OS X installer should run automatically, but if not then you can try running it manually: Go to the Applications folder. Open the program called “Install OS X El Capitan”. Follow the on-screen instructions. If this program is missing or will not run, then move it to the trash and empty the trash, followed by re-downloading it.

Install Yosemite or El Capitan from Scratch

Backup if possible before continuing.

Reinstall El Capitan

Os X El Capitan Cannot Be Installed On Macintosh Hd

1. Restart the computer. Immediately after the chime hold down the Command and Rkeys until the Apple logo appears. When the Utility Menu appears:
2. Select Disk Utility from the Utility Menu and click on Continue button.
3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
5. Set the Format type to Mac OS Extended (Journaled.)
6. Click on the Apply button, then wait for the Done button to activate and click on it.
7. Quit Disk Utility and return to the Utility Menu.
8. Select Reinstall OS X and click on the Continue button.

Aug 9, 2016 5:35 PM