This happens if you forget the /LimitAccess switch in the DISM command. Windows tries to go online, fails, and aborts. Re-run the command ensuring /LimitAccess is included to force the offline behavior.
Windows 10 offers an online installer. When you enable .NET 3.5 via "Windows Features," Windows Update downloads the required files. This sounds easy, but it fails frequently due to:
The solution is the offline installer – a standalone .cab or .exe file that contains all the necessary components. You can copy it to a USB drive, use it on multiple PCs, or install without an internet connection. This happens if you forget the /LimitAccess switch
After installation, confirm everything works.
Or simpler:
Microsoft .NET Framework 3.5 is a legacy software framework required for many older applications (e.g., certain CAD software, ERP systems, and games). While Windows 10 includes the installation files, a standard online installation requires downloading components from Windows Update. An offline installer is essential for systems without internet access or those needing a repeatable, local deployment.
While not natively supported, this method can work on Windows 10, though it requires a workaround. Windows 10 offers an online installer
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.