Mac OS sierra app is damaged

Verify you have your >System Preferences>Date&Time> Set to Automatic

and try again. (If it is already checked then try unchecking.)

delete all previous downloaded copies, and down load again.

THANK YOU! This helped me. The problem was that the machine thought it is in 2001. So using the date command to set up the correct date and time fixed this problem. I was not able to use the ntpdate as the computer wasn't online. I wasted multiple hours trying to fix this and tried a lot of things, but this helped.

This totally worked for me! Thank You!

My Scenario: 5 year old MacBook Pro was dropped and damaged the hard drive. I put a new one in and made a bootable USB drive to reinstall High Sierra. It kept giving me the "This copy of the Install macOS High Sierra.app application is damaged, and can't be used to install macOS." I ran "ntpdate -u time.apple.com" in terminal as indicated and it worked fabulously!

That did help a little, I deleted the plist file from the prepared usb stick.

On installing i got a new error "the installer payload failed signature check"

So in utillities i opened the terminal and typed ntpdate -u time.apple.com

This sets the internal clock end from there everything went smooth

i got this from the tip in this site

https://www.macworld.com/article/3097533/macs/installing-os-x-what-to-do-when-th is-copy-of-the-install-os-x-application-…

Try to set the date to actual date via terminal. You have to type something like this: date 0712122318 in the [mm][dd]HH]MM[yy] format

The fix for me (as others mentioned):

1)Build bootable macOS USB disk

2) Boot to USB

3) Launch Terminal and run "ntpdate -u time.apple.com"

4) Install MacOS

Step 1. Go to your applications folder.

Step 2. Find the installer for macOS Sierra.

Step 3. Right click on the installer and click "Show Package Contents".

Step 4. Click on folder named "Contents".

Step 5. Click on the folder named "SharedSupport".

Step 6. Delete the file named "InstallInfo.plist".

Step 7. Enter your administer password to confirm.

Step 8. Now open the installer.

The fix for me (as others mentioned):

1)Build bootable macOS USB disk

2) Boot to USB

3) Launch Terminal and run "ntpdate -u time.apple.com"

4) Install MacOS

I think I have the answer.

Summary

1. Turn off SIP

2. Install High Sierra

3. If you enjoy pain, turn SIP back on.

Detailed steps

1. Restart the computer

2. Immediately hold down CMD+R and release it when the Apple logo appears.

3. Select Utilities | Terminal from the menu bar

4. On the command line type “csrutil disable”

5. On the command line type “reboot”

6. Download and install High Sierra

If you enjoy pain in your nether region, repeat steps one through five, but type “csr enable" in step four. We’ve been running OS X without anything resembling SIP for years and years, so it is probably safe to run without it.

Okay, the problem can be solved by setting the date before installing. I have four questions for the developers of the installation program:

1. What did you do in previous versions of the operating system installer that you forgot to do in this one?

2. Is there a bug in the software that updates the time over the internet? How else could the date and time be wrong for everyone?

3. Why wasn't the installation program written to ignore the time?

4. Why wasn't the installation program written to set the time as the first step?

The most positive spin I can put on this is that it is only natural that this problem would exist. Management is thinking too much about us and therefore has a policy of releasing a new version every year. They aren't thinking about the developers enough because a year is too short even for super-developers from Krypton. Management shot itself in the foot because the one-year mandate is supposed to please customers but results in updates that don't please customers!

Apple management needs to change the mandate so that they put out a new version every TWO years.

Thanks slvrstrk. Updating the time and date via NTP in the terminal worked for my High Sierra install.

Step 1. Sign out of the App Store.

Step 2. Restart your computer.

Step 3. Sign back into the App Store.

Step 4. Try to download again.

If this does not work then stop and give detail's on what failed.

If it did work but you encounter the follow message "This copy of the Install macOS Sierra.app application is damaged, and can't be used to install macOS."

Then do the following.

Step 1. Go to your applications folder.

Step 2. Find the installer for macOS Sierra.

Step 3. Right click on the installer and click "Show Package Contents".

Step 4. Click on folder named "Contents".

Step 5. Click on the folder named "SharedSupport".

Step 6. Delete the file named "InstallInfo.plist".

Step 7. Enter your administer password to confirm.

Step 8. Now open the installer.

Its weird this issue goes on, as High Sierra is out for almost a week.

So... Onyx is a solution, despite somebody using here the „I” argument (I would not use Onyx). Sierra and High Sierra are more... I don't know, tight? in many ways, they brought many things to a new level, so a flawless base for installation is necessary. If this routines for repairing index, permissions and the rest doesn`t suits to the troubled users, I recommend partitioning the hard disk, moving all essentials documents on the non-system partition and proceding to a clean install. It may imply a bit much work, having to reinstall back all applications, but its just a matter of hours - less then spending days riding around the internet and chasing for smart solutions.

Thank you this fixed my issue on high sierra. i deleted the installnfo.plist and it worked 🙂 i was trying to do a clean install and it kept saying image is damaged, but put the image to a usb and i deleted the installnfo.plist file and then it worked thanks @thubredhal

Paclypse71 wrote:

Thanks, that worked for me. I don't understand what a Safari 10 update has to do with being able to update the OS,

Obviously, this was not common, the vast majority have not had problems, like me