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Pete, Computer Engineer
Category: Mac
Satisfied Customers: 17640
Experience:  Over 16 years of computer experience, CISCO certified
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I wanted to install OS Sierra, it took four hours to

Customer Question

I wanted to install OS Sierra, it took four hours to download, now it says that the copy of the install file is damaged. What can I do?
JA: How much experience do you have with this particular machine?
Customer: I use it since three years, but I am no geek
JA: Have you installed any updates recently?
Customer: various: safari, iTunes, etc.
JA: What troubleshooting have you tried?
Customer: I am trying you :-)
JA: Anything else you want the Mac expert to know before I connect you?
Customer: not really
Submitted: 9 months ago.
Category: Mac
Expert:  Pete replied 9 months ago.

Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.

Expert:  Pete replied 9 months ago.

Try 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 ***** confirm.

Step 8. Now open the installer.

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