Getting “Bye Bye Big Sur” error on installing Big Sur

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2021-06-09 07:30:10

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My current macOS version is 10.14.6 (18G103). I have downloaded Big Sur from App Store but when I am trying to install, I am getting error "Bye Bye Big Sur" when I click on installer.

That is not a macOS prompt. The icon is from Jamf, a mobile device management solution used by organisations to control devices. Your IT department has most likely blocked Big Sur. They control the dialog and text content. Contact your company or device administrator.