Support for System.Xml.Linq.dll and System.ComponentModel.DataAnnotations.dll has been added to the Portable Class Library project when targeting .NET Framework 4.0.3. For more information about how to install Portable Class Library support, visit the Portable Class Library article on MSDN.

The Microsoft .NET Framework 4.8 is a highly compatible, in-place update to the Microsoft .NET Framework 4, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 and 4.7.2. The offline package can be used in situations in which the web installer cannot be used because of lack of Internet connectivity.

Microsoft .NET Framework 4.8.1 is a highly compatible and in-place update to .NET Framework 4.8. It includes native support for the Arm64 architecture (Windows 11+), accessibility improvements as well as other improvements. For a complete list of improvements see: .NET Framework 4.8.1 release notes.

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When you visit a Web site or run an application that loads XHTML documents by using Microsoft XML Core Services (MSXML), MSXML will send requests to the World Wide Web Consortium (W3C) to fetch well-known Document Type Definition (DTD) files every time. This behavior may bring lots of traffic to the W3C server.

To fix this issue, do one or more of the following: If there’s another Wi-Fi network that’s in range that you recognize and trust, disconnect from your current Wi-Fi network, then connect to the other one. For more info, see Connect to a Wi-Fi network in Windows.