Users may encounter failures to download and install macOS updates when Apple servers are overloaded, therefore sometimes simply waiting a bit can be helpful. This is particularly relevant if the software update you are trying to install is brand new, like a major system software release (this happened with Big Sur for example).
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I had this error with Big Sur, which occurred during installation after I had downloaded it. It happened with both the update via the system preferences, and the download. The solution was to turn off networking.
But ultimately, relying on any one app to protect your system, data, and privacy is a bad bet, especially when almost every antivirus app has proven vulnerable on occasion. No antivirus tool, paid or free, can catch every malicious bit of software that arrives on your computer. You also need secure passwords, two-factor logins, data encryption, systemwide backups, automatic software updates, and smart privacy tools added to your browser. You need to be mindful of what you download and to download software only from official sources, such as the Microsoft App Store and Apple Mac App Store, whenever possible. You should avoid downloading and opening email attachments unless you know what they are. For guidance, check out our full guide to setting up all these security layers.
There are 59 files for the SCCM updates in the internet connected server, and I moved all 59 to the disconnected server. First time I downloaded them from a Win10 PC, and now I tried it from a 2012R2 server.
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