. Windows will automatically download and install the required components. Microsoft Learn Install .NET Framework 3.5 on Windows 11 - Microsoft Learn
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:<DRIVE_LETTER>:\sources\sxs
The files are specifically located in the \sources\sxs folder of your media. 3. Quick Online Activation If you do have internet but just need the feature enabled: Install .NET Framework 3.5 on Windows 10 - Microsoft Learn