The "Install macOS is corrupted" prompt is usually caused by security mechanisms rather than file corruption. Common reasons include unofficial download sources, incomplete files, failure to verify signatures in the old system, or misjudgment of Gatekeeper; solutions include: 1. Forced opening of the installer through terminal commands and creating a startup USB flash drive; 2. Temporarily closing Gatekeeper verification; 3. Remount the installer and delete kernelcache file repair permissions; ways to avoid problems include prioritizing the use of official channels to download, verify the SHA256 value, selecting a trusted third-party site, and avoiding modification of the installation content.

The macOS installer you downloaded shows "This copy of Install macOS is corrupted". It is not usually because the file is really broken, but because the system prevents it from running due to security mechanisms. This problem is especially common when using installation packages downloaded from unofficial channels.

Why does the prompt "Install macOS is corrupted" appear?

macOS has a strict verification mechanism for installers, especially applications downloaded from the Internet. When you try to open the Install macOS app, the system checks whether its signature comes from Apple or has been tampered with.

Common reasons include:

• The download source is not an Apple official website or a trusted channel
• The file is corrupt or incomplete during transfer
• The system version is too old to recognize the signature of the new installer
• Gatekeeper security mechanism misjudgment

How to solve the problem of "Install macOS is corrupted"?

If you confirm that the download source is reliable (such as the Heiguo Community, well-known mirroring stations, etc.), you can try the following methods to bypass the verification:

Method 1: Force opening the installer through "terminal"

1. Open Terminal
2. Enter the following command (taking Ventura as an example):

    sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

3. Replace the path above with your actual installer name and target USB disk name
4. Enter the password and execute it

This can directly skip the security check of the graphical interface and start the installation process.

Method 2: Turn off Gatekeeper verification (temporary)

1. Open the terminal
2. Enter the command:

    sudo spctl --master-disable

3. Try opening the Install macOS app again

It is recommended to restore verification after completion:

 sudo spctl --master-enable

Method 3: Remount and repair permissions

Sometimes it's just a permission issue, you can try:

• Right-click Install macOS application → Show package content
• Go to Contents → Resources folder
• Delete kernelcache file (if any)
• Rerun the installer

How to avoid encountering this problem again?

To avoid repeated tossing, it is recommended that you pay attention to the following points when downloading and using the macOS installer:

• Try to use the official Apple channel to download the installer (such as through the App Store or specific command line tools)
• Use a verification tool such as Checksum to check the SHA256 value of the downloaded file
• If you download it from a third-party website, you will be given priority to sites with reputation (such as Black Fruit Little Soldier, Mac App Store Mirror, etc.)
• Do not modify the content of the installer (such as replacing kernel, driver, etc.), as it may cause signature failure.

Basically these are the methods. Although the prompt says "corrupt", most of the time, the signature verification is just not passed. As long as you ensure that the source is reliable, you can continue to install with confidence.

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