Big Sur vs. Gatekeeper Policy

You need to disable the gatekeeper through terminal. Once disabled, re-attempt to update your computer. You won’t have the error message anymore. Once you have updated successfully, make sure to enable gatekeeper.

https://osxdaily.com/2015/05/04/disable-gatekeeper-command-line-mac-osx/

I was running OSX 10.15.7 when attempting this

uncultured Said:

”Big Sur vs. Gatekeeper Policy: Update: Issue resolved, downloading from App store did fix the issue indeed,"

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Inform Apple of this Fix:

I would inform Apple of this issue, and let them know of your fix. That will help many for sure. Use the Feedback Info in my above reply.

uncultured Said:

”Big Sur vs. Gatekeeper Policy: [...]I looked up Gatekeeper in my System Prefs, and I currently have it set to allow ‘installation of apps from App Store and identified developers’.”

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Provide your Feedback:

Do your Part: Inform Apple of your feedback of this issue. Include how you’ve troubleshot this, and your results. Apple wont get back to you directly, but the more feedback they receive from its users, the more likely they will know what needs to be fixed, and what their customers prefer in future macOS updates to come.

1. Go Here: Feedback - macOS - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Select: "Installation/Setup" for the "Feedback Area"
4. Proceed from there as necessary

The error persisted even after multiple past attempts.

Issue resolved today after contacting Apple Support. Pls check out the following suggested steps:

1. On your Mac, choose Apple menu > System Preferences, then click Users & Groups > add new user account as Administrator. Upgrade to Big Sur from the new Admin user account.
2. In case the error repeats in the above step, click on AppStore > macOS Big Sur and download the same.
3. If both the above don't work, the final option is to reinstall the OS through recovery mode.

https://support.apple.com/kb/HT204904

On an Intel-based Mac, you can use Option-Command-R at startup to upgrade to the latest macOS that is compatible with your Mac. 

The 2nd step worked for me after I encounter the download error in the 1st!

Update: It still hasn't worked after several download attempts, however I was advised to try downloading the installer from the App Store instead of the Software Update. Even though I personally still can't get the update to work but it could be worth giving it a shot.

I hope some of the senior fellows could suggest any help sometime soon.

wmsfromshillong Said:

"I also have the same problem. APPLE should get a solution to this pronto. It hurts all Mac users to see that their favourite OS is facing internal problems caused by APPLE itself"

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Inform Apple of this, as mentioned in my above reply.

Update: Issue resolved, downloading from App store did fix the issue indeed,

1. Reboot, and makes sure you wait until the preferences badge notification indicates an update is available,
2. open app store search for macos big sur,
3. click get, and it will send you to the software update asking for confirmation that you want to upgrade.
4. If it fails reboot and try again

this worked like a charm for me.

I am getting the same error "the package installassistant.pkg fails to meet gatekeeper policy"

It seems that the first time at least the entire package was downloaded properly yet the issue was with some authentication/verification/signing and was blocked by firewall/gatekeeper.

Any help is appreciated.

Sure however I have already contacted Apple in regards to this matter and they have been informed about this. Nonetheless it wouldn't hurt to report a bug Thanks for the advice.

Would Feedback Assistant work for reporting this?

YoussefElZein Said:

“Sure however I have already contacted Apple in regards to this matter and they have been informed about this. Nonetheless it wouldn't hurt to report a bug Thanks for the advice. Would Feedback Assistant work for reporting this?”

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Use the Feedback Forums.

The Feedback Forum submittals go strait to Apple’s Techs.

I have an app called Silent Knight, that lists all Xprotect, Firmware, Gatekeeper etc and the versions present and expected. I note Gatekeeper has an ! Against it...

I wonder if you are all updating Catalina to it’s latest release before trying Big Sur?

I'm having the same problem.

i have the same problem #APPLE we need a solution to this matter.

I also have the same problem. APPLE should get a solution to this pronto. It hurts all Mac users to see that their favourite OS is facing internal problems caused by APPLE itself