While not natively supported, this method can work on Windows 10, though it requires a workaround.
Run the Setup:
Navigate to the extracted folder and run the setup inside the wcu folder. Note that Windows 10 may still attempt to download some components via Windows Update to replace older files during installation.
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
(Replace D: with your mounted ISO drive letter) While not natively supported, this method can work
After installation, confirm everything works.
Or simpler:
Struggling to install an older application on your modern Windows 10 PC? You are not alone. Many popular business apps, classic games, and engineering tools (like AutoCAD, SolidWorks, and SAP GUI) rely on Microsoft .NET Framework 3.5. While Windows 10 comes with newer versions (4.x) pre-installed, version 3.5 is often missing.
If you see an error message saying "Your PC needs to be updated to install .NET Framework 3.5" or "The following feature couldn't be installed," don't panic. The most reliable solution is the .NET Framework 3.5 Windows 10 64-bit offline installer. Run the Setup: Navigate to the extracted folder
In this article, we’ll explain what this tool is, why you need the offline version, where to download it safely, and how to install it step-by-step.