.NET Framework 3.5 is a critical component for many applications. Despite being superseded by newer versions (4.x, 5, 6, etc.), its compatibility layer is required for countless proprietary enterprise applications, games, design software (like many older versions of AutoCAD), and legacy tools that were built on .NET 2.0, 3.0, or 3.5.
by right-clicking the file and selecting Mount .
dism /online /add-package /packagepath:"C:\Microsoft-Windows-NetFx3-OnDemand-Package.cab" Use code with caution.
If the GUI method fails, it is highly likely due to missing source files, and you should fall back to the DISM command-line method.
In the command prompt window, type or copy/paste the following command. Make sure to replace C:\NetFx3.cab with the full path to your CAB file.
Work Download Microsoft-windows-netfx3-ondemand-package.cab Jun 2026
.NET Framework 3.5 is a critical component for many applications. Despite being superseded by newer versions (4.x, 5, 6, etc.), its compatibility layer is required for countless proprietary enterprise applications, games, design software (like many older versions of AutoCAD), and legacy tools that were built on .NET 2.0, 3.0, or 3.5.
by right-clicking the file and selecting Mount . Download Microsoft-windows-netfx3-ondemand-package.cab
dism /online /add-package /packagepath:"C:\Microsoft-Windows-NetFx3-OnDemand-Package.cab" Use code with caution. Download Microsoft-windows-netfx3-ondemand-package.cab
If the GUI method fails, it is highly likely due to missing source files, and you should fall back to the DISM command-line method. Download Microsoft-windows-netfx3-ondemand-package.cab
In the command prompt window, type or copy/paste the following command. Make sure to replace C:\NetFx3.cab with the full path to your CAB file.