I recently bought a 2019 Macbook Pro on ebay and am having trouble updating. Current version of MacOS Catalina 10.15.7. I downloaded the Monterey Installer but a minute after the installation starts, the installer constantly gives the error “Installation cannot proceed because the installer is damaged.” I tried changing the date, resetting NVRAM, downloading different MacOS installers from the App Store and in .pkg format, Safe Mode install. Nothing helps. Has anyone encountered this? Is there a solution?
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