I get the following message: Installing Mac OS Big Sur: Message shows: “Installation cannot proceed because the installer is damaged.”. My MacBook is a nearly new MacBook Pro (16-inch, 2019)
MacBook
Hello jimbob-winch,
Welcome to Apple Support Communities. Keeping your Mac up-to-date on software is super important, and we'd be happy to look into this with you.
Does this happen when you connect your Mac to another wireless or wired network? Also, let’s try to download and install the macOS update from the App Store using this link:
Be sure to disconnect any peripherals from your Mac as well before trying the install again.
If that didn't help, let's try to try again after logging into another user account on your Mac. Here's how to create one:
Set up users, guests, and groups on Mac
We hope this information is useful. Kind regards.
Hello jimbob-winch,
Welcome to Apple Support Communities. Keeping your Mac up-to-date on software is super important, and we'd be happy to look into this with you.
Does this happen when you connect your Mac to another wireless or wired network? Also, let’s try to download and install the macOS update from the App Store using this link:
Be sure to disconnect any peripherals from your Mac as well before trying the install again.
If that didn't help, let's try to try again after logging into another user account on your Mac. Here's how to create one:
Set up users, guests, and groups on Mac
We hope this information is useful. Kind regards.
Open your Applications folder and locate Install macOS Big Sur.app,
move it to the Trash, empty the Trash.
Connect your mac to your router via cable rather than WiFi.
Restart your mac re-download the Big Sur installer, do not use
the mac while it is downloading or any other devices that share the same
internet connection.
Many thanks kareng12. I followed your suggestion and it worked like a charm!
Many thanks for your suggestion Eau Rouge. I had used another suggestion successfully before I saw yours but it was most helpful of you to take time replying to me
I was able to install Big Sur only after turning off the firmware password.
What exactly did you do to get it to work i redownload multiple times i even create a user but still it doesn’t work
Installing Mac OS Big Sur: Message shows: “Installation cannot proceed because the installer is damaged.”
