macOS 12 Monterey Installation Failed, An Error Occurred Learn the right way to update to Monterey > 2. Overloaded Apple's server is also a main cause. So you need to go to Mac App Store and download the official macOS Monterey instead to fix it. Usually Mac update download failed error is originated that you download the package from somewhere other than Mac App Store or you just downloaded the Beta version. It's exceedingly annoying, but there is no way to bypass this step for macOS update. Try again later.', or 'An error has occurred.' Monterey download times are slow this year and are always failing. That content can't be downloaded at this time. As you attempt to download macOS 12 Monterey installer, you may be noticed that 'Installation requires downloading important content.
