Installation of El Capitan problem: "an error occurred during the preparation of the installation. Try running the application again. »

I've been a fight 2 days now trying to improve my iMac 21.5 2009 end of Mavericks in El Capitan, but as the installation is about to be launched I get this message "an error occurred during the preparation of the installation. Try running the application again".

Here is a list of all the things I've tried:

Running the application again;

Move the installation to another folder application;

Control date & time and it was already correct;

Do the installation in safe mode;

Installation of the upgrade of another user I created only for that purpose;

The computer restarts and I tried install the upgrade several times;

And, to be sure that the installation application was not corrupted I made a copy of it on an external HD and tried to install it on my 2011 MacBook Air and it worked (I didn't install because I have El Capitan installed on my MacBook).

Well, I don't know what else can be done, and I'd rather not have to completely restore my iMac.

Please try installing again after taking each of these steps you have already taken it.

Step 1

Reset the PRAM from your computer.

Step 2

If possible, set the clock system as indicated here. If you can only boot into recovery mode, see below.

In the OS X Utilities screen, select get online help. Safari will launch. While in recovery, you will have no access to your bookmarks or history. Load this web page.

Triple-click anywhere in the line below to select:

date 0801000014

Copy the selected text in the Clipboard by pressing Control-C key combination.

Quit Safari. You go back to the OS X Utilities screen.

Select

Utilities ▹ Terminal

in the menu bar. It will open a Terminal window. Paste in the window by pressing the command-V key combination.

Wait for a new line ending with a dollar sign ($) below what you entered. If it does not appear, press return.

Quit the Terminal to return to the main screen.

Step 3

If your model has replaceable memory by the user and you have upgraded modules of memory, reinstall the original memory and see if there is any improvement. Make sure not to touch the Gold contacts. Clean them with a mild solvent such as rubbing alcohol. Spare memory must exactly match the technical specifications of the machine. Do not install more memory to the maximum value specified, even if a seller of RAM, or someone else, said you that it will work.

Step 4

Back up the data at least two different storage devices, if you haven't done so already. A backup is not enough to be sure. Backups are possible with Time Machine or disk utility. Preferably both.

Erase and install OS X. This operation will destroy all the data on the boot volume, if you be better be sure backups.

Tags: Mac OS & System Software

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