If you try to use the standard installer and receive an error code like 0x800F0906 , it means Windows is struggling to find the source files offline. In this case, use Method 3 below, which uses a small utility to automate the offline installation process without needing a full Windows ISO.
The standard 3.5 installer is also available, though it may attempt to fetch additional updates if an internet connection is detected. 2. Install Offline via Windows ISO (No Download Needed) If you try to use the standard installer
: Once the progress reaches 100%, the feature is enabled. How to Install .NET Framework 3.5 on Windows 11 [Tutorial] use Method 3 below