When you troubleshoot communications problems in Windows, an MS-DOS-level communications program is often required to test the modem and ports outside of Windows. If an MS-DOS-based application cannot be used, it is possible to test the modem connections by typing the following command at the MS-DOS command prompt.

Download the installer for all versions of Windows except 64-bit versions of Windows Server 2003 or 64-bit versions of Windows XP. The following file is available for download from the Microsoft Update Catalog: Download the Windows Installer 3.1 Redistributable (v2) package now. Release Date: May 12, 2005.

Download drivers and firmware for Surface. Windows 11 Windows 10 Surface. Updates keep your Surface performing its best. Along with software updates for Windows 10 or Windows 11, it's important to make hardware updates, also known as updates for drivers and firmware.

Equation Editor (Microsoft Equation 3.0) was included in earlier versions of Word, but was removed from all versions in the January 2018 Public Update (PU) and replaced with a new equation editor. The content here describes this feature for users who have installed this update.

The following file is available for download from the Microsoft Download Center: Download the package now. For more information about how to download Microsoft support files, click the following article number to go to the article in the Microsoft Knowledge Base: How to obtain Microsoft support files from online services

Install this update. File information. For a list of the files that are provided in this update, download the file information for cumulative update. Prerequisites. To apply this update, you must have .NET Framework 3.5 or 4.8 installed. Restart requirement.

This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website. File information. For a list of the files that are provided in this update, download the file information for cumulative update .

Install this update. File information. For a list of the files that are provided in this update, download the file information for cumulative update . Prerequisites. To apply this update, you must have .NET Framework 3.5 or 4.8.1 installed. Restart requirement.

October 10, 2023-KB5031223 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2. .NET. Release Date: October 10, 2023. Version: .NET Framework 3.5, 4.8 and 4.8.1. IMPORTANT. This update is included in the Cumulative Update that's dated October 10, 2023.

For more extensive information about deploying .NET Framework 3.5, see Microsoft .NET Framework 3.5 Deployment Considerations. All updates for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 require that update KB 2919355 is installed.