Take a look at: https://www.ajtek.ca/wsus/how-to-install-net-3-5-rsat-tools-and-other-optional-components-with-wsus/
It should get you fixed up.
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I am trying to install the .NET framework 3.5 . I have tried different methods from Internet but still I couldn't resolve it.
I have tried the first 4 methods from the link below. Apart from that I tried turning on the feature from Turn windows features on or off menu in control panel but still I get the error the system cannot find the file specified. Could you please help me to resolve this issue?
https://geeksadvice.com/fix-error-code-0x80070002-on-windows/
Take a look at: https://www.ajtek.ca/wsus/how-to-install-net-3-5-rsat-tools-and-other-optional-components-with-wsus/
It should get you fixed up.