Most modern apps run on .NET Framework 4.0 or later, which is included by default in Windows 10. However, many older "legacy" programs and games developed for Windows 7 or earlier strictly require version 3.5 to function. Common reasons to install it include: Running legacy industrial or engineering software.
microsoft-windows-netfx3-ondemand-package.cab Net Framework 3.5 Offline Installer Windows 10 64 Bit
Months ago, a senior dev had mentioned a backup. “Always keep a full standalone copy of .NET 3.5 on a flash drive,” he’d said. “It’s the skeleton key for old Windows apps.” Most modern apps run on
Because .NET 3.5 uses CLR 2.0, it is technically a completely different runtime engine than the .NET 4.x versions included with Windows 10. This is why Windows 10 must add the .NET 3.5 feature; it is not merely enabling a dormant feature but installing a legacy runtime side-by-side with the modern one. microsoft-windows-netfx3-ondemand-package
dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Copied to clipboard 4. Wait for Installation to Complete to run the command. You will see a progress bar in the command prompt. Wait until it reaches 100% and displays the message: "The operation completed successfully."
The /limitaccess flag prevents Windows Update from being used. The /source points directly to the sxs folder on the Windows 10 ISO, which contains the exact 64-bit .cab files for .NET 3.5.
and note the drive letter assigned to the mounted ISO or USB (e.g.,