How to Fix “An error occurred while preparing the installation” Error on Mac?

A very common error that is encountered by a number of Mac users when they try to install an Operating System on their MAC states “An error occurred while preparing the installation, try running this application again” and prevents them to install the OS. This error can be solved after going through some steps that are explained in this article below.

Macbook display of "an error occurred while preparing the installation"
Error Message

What prevents us from installing an OS on Mac?

This error is becoming very common and different reasons are considered to be causing this issue in different cases. Some of the most common causes are listed below:

  • This error might occur if there are an incorrect date and time set in your Mac.
  • If the NVRAM is not clear, this error message might pop up on the screen.
  • The problem might occur due to data corruption due to multiple resumes during download.

Pre Tips:

If you are unable to install an OS on your Mac, it might be due to the macOS 10.15 previously installed because it could be damaged due to multiple resumes during the download. Try to delete it first from the application folder and then download again the entire Mac OS Catalina. See if you can resolve the issue by doing so.

Download Mac OS Catalina to get rid of an error occurred while preparing the installation
Mac OS Catalina

What to do if an error occurs while preparing the installation on Mac?

Solution 1: Fix Date and Time

If this error still arises on your machine, fix the date and time by following the steps given below and see if the issue is resolved or not.

  1. Boot from Mac OS X installation disk.
  2. Click Utilities and then go to Terminal.
    Navigate to the terminal and copy paste commands provided to resolve an error occurred while preparing the installation on Macbook
  3. Now type the date in the terminal and check the current date and time.
  4. To fix the date, if it is incorrect, type in the current date/time in the following format date mmddHHMMyyyy.
    Set the date and time as shown
    Setting Date

Solution 2: Clear NVRAM

If you still can’t get rid of “an error occurred while preparing the installation” issue, try to clear the NVRAM and see if you can resolve this error. Follow the steps below to carry this task out.

  1. Shut down your Mac.
  2. Re-Start the Mac.
  3. As soon as you hear startup chime press and hold keys Command + Option + P + R on the keyboard.
    Press the following buttons on keyboard
    Keyboard Shortcuts
  4. Keep holding these keys on the keyboard until Mac reboots.
  5. You can release these keys after you hear another startup chime.

If you need more assistance, contact here.

Alan Adams

Alan is a hardcore tech enthusiast that lives and breathes tech. When he is not indulged in playing the latest video games, he helps users with technical problems that they might run into. Alan is a Computer Science Graduate with a Masters in Data Science.
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