.NET Framework January 2024 Cumulative Update Preview

.NET Framework is a software platform that enables developers to create and run applications on Windows, Linux, and macOS. It provides a common set of libraries, tools, and languages that support a variety of scenarios, such as web, desktop, mobile, cloud, gaming, machine learning, and IoT.

Microsoft regularly releases updates for .NET Framework to improve its security, reliability, and performance. These updates are usually delivered through Windows Update, Microsoft Update, or Windows Server Update Services (WSUS). However, sometimes Microsoft also releases preview updates that are not automatically installed, but are available for download and testing before the final release.

In this blog post, we will discuss the latest preview update for .NET Framework, which is the January 2024 Cumulative Update Preview. This update applies to .NET Framework 3.5 and 4.8.1 on Windows 11, version 22H2 and Windows 11, version 23H21. We will cover the following topics:

  • What are the benefits of installing this update?
  • What are the issues that this update addresses?
  • How to get this update?
  • How to provide feedback on this update?

Benefits of Installing This Update

The January 2024 Cumulative Update Preview for .NET Framework is a non-security update that contains quality and reliability improvements. By installing this update, you can benefit from the following advantages:

  • Enhanced stability and performance of your .NET Framework-based applications.
  • Reduced risk of encountering errors or bugs in your .NET Framework-based applications.
  • Improved compatibility and interoperability with other software components and platforms.
  • Access to the latest features and enhancements of .NET Framework.

Issues That This Update Addresses

The January 2024 Cumulative Update Preview for .NET Framework addresses the following issues that were reported by customers or identified by Microsoft:

  • ASP.NET: Fixed an issue with “System.ArgumentException: Illegal characters in path” in some ASP.Net MVC requests1.
  • .NET Libraries: Fixed an issue where version of the OSS zlib library is out of date1.

How to Get This Update

The January 2024 Cumulative Update Preview for .NET Framework is not automatically installed through Windows Update, Microsoft Update, or WSUS. You have to manually download and install it from the Microsoft Update Catalog website1. Alternatively, you can also go to Settings > Update & Security > Windows Update, and in the Optional updates available area, you will find the link to download and install the update1.

Before you install this update, make sure that you have .NET Framework 3.5 or 4.8.1 installed on your system. You also have to restart your computer after applying this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you install this update.

How to Provide Feedback on This Update

Microsoft welcomes your feedback on the January 2024 Cumulative Update Preview for .NET Framework. You can use the following channels to share your comments, suggestions, or issues:

  • Windows 11 Feedback Hub app: You can use this app to submit feedback directly to Microsoft. To do this, go to Start > Feedback Hub, and then follow the instructions to provide your feedback.
  • Microsoft Support: You can contact Microsoft Support for technical assistance or to report any problems with this update. To do this, go to the Microsoft Support website2 and select the appropriate option for your issue.
  • Microsoft Community: You can join the Microsoft Community forum to discuss this update with other users and experts. To do this, go to the Microsoft Community website3 and search for the relevant topic or create a new one.

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