Locate your Windows 10 or Windows 11 in File Explorer. Right-click the ISO and select Mount . Locate your Windows 10 or Windows 11 in File Explorer
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:C:\net35 /LimitAccess
This error occurs when the DISM tool cannot find the source files it needs. The most common cause is a version mismatch between the source files you are using and your current Windows version. For instance, using a Windows 10 ISO on a Windows 11 computer (or vice-versa) often triggers this error. The most common cause is a version mismatch
Ensure you are using Method 1 (ISO/USB method) , as this directly provides the needed sxs folder.
If you have an internet connection and just want the easiest method: If you have an internet connection and just
Установка .NET Framework 3.5 в Windows 10 - Microsoft Learn
An offline installer becomes essential in several scenarios: