Content that has been superseded for more than a year are removed from the Patches for Windows site.
The KB’s you have listed fall into that category.
You can search the MS catalog for supersedence information.
For example, KB4011262 (https://www.catalog.update.microsoft.com/Search.aspx?q=4011262).
Click one of the two links, then hit the “Package Details” tab for supersedence information.