@Steve Bailey Did you install SharePoint updates from Windows updates previously?
As best practices, we suggest you install SharePoint updates via downloading these updates and installing manually instead of Windows updates because deploying SharePoint updates via Windows updates maybe cause some unknown issues.
The following article lists SharePoint 2013 Foundation updates history, you can download updates as your need.
https://learn.microsoft.com/en-us/officeupdates/sharepoint-updates#sharepoint-2013-update-history
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