What Should do Before Upgrading to macOS Big Sur?
“Unable to check for updates: Timed out while loading data from the Apple Software Update server” (Note: I am running 10.14.6 on my Mac-HD.) So I tried going to the Apple website and download the macOSUpd10.14.6Supplemental (dmg), and when the Installer gets to a certain place (Destination Select step), it gives me the following. According to Software Update, 19% of the update was downloaded but it is not in /Library/Updates. Software Update is reporting 3 hours to download the remaining 81%. I'll wait until Apple resolves whatever issues are plaguing users. I would like to start over fresh, however, but it appears the download is not saved in one location. Nov 12, 2020 Apple confirmed that Software Update is experiencing issues on its System Status page. Users may not be able to download macOS Software Updates on Mac computers. The issue is currently being. AirPlay Mirroring requires an Apple TV (2nd generation or later). AirPlay for web video requires an Apple TV (2nd generation or later). Peer-to-peer AirPlay requires a Mac (2012 or later) and an Apple TV (3rd generation rev A, model A1469 or later) with Apple TV software 7.0 or later.
Although the every new macOS upgrade comes with certain exciting features, you need to know if your Mac computer can safely be updated (take Big Sur as an example). If you pay no attention to the details, macOS Big Sur update problems come with you for sure, probably your Mac update stuck or Mac failed update won't boot. Here are some of the things that you should look for before you upgrade to the new update.

Apple Software Update Not Downloading

1.Check compatibility. Big Sur requires any of the following Mac models: iMac; MacBook Pro; MacBook Air; MacBook; Mac Pro; Mac Mini.
2.Check minimum software and hardware requirements. You should have OS X Mountain Lion 10.8 or later. It requires at least 35.5GB of storage space to perform the Big Sur upgrade from macOS Sierra or later, 44.5GB from an earlier release.
3.Backup your Mac. To avoid any possible macOS Big Sur update problems, making a backup of your Mac comes essential. You can backup Mac with Time Backup Machine, iCloud, iTunes, or any other third-party Mac backup tools like MacX MediaTrans.
How To Update Mac Software
There really needs to be a pause function or at least an automatic recovery of those incomplete downloaded updates. Come on, Apple, get on this.
And please, no more 'answers' like @baltwo - Don't tell me when to do my updates - thats not the problem, the problem is loss of downloaded data for no reason.
Safari 14.0.1
Aug 06, 2010 To report this issue to Apple's engineering, send a bug report or an enhancement request via its Bug Reporter system. To do this, join the Mac Developer Program—it's free and available for all Mac users and gets you a look at some development software. Since you already have an Apple username/ID, use that.

