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) often fail or require an internet connection to "verify" the installation. Microsoft Learn

dism /online /Enable-Feature /FeatureName:NetFx3 /All /Source:C:\net35 /LimitAccess

If your internet connection is stable and you want to try the built-in Windows interface before sourcing offline files, follow these quick steps:

This time, point the /Source: parameter to the sxs folder on your mounted ISO. Replace D: with the actual drive letter of your mounted ISO:

This is the most reliable way to install the framework without an internet connection. You will need your or a bootable USB drive .