To install .net 3.5 Offline in windows 10.
Open Command prompt as administrator.
Type the following command.
Dism /online /enable-feature /featurename:NetFX3 /All /Source: (installation media) :\sources\sxs
Eg : Dism /online /enable-feature /featurename:NetFX3 /All /Source:f:\sources\sxs
Open Command prompt as administrator.
Type the following command.
Dism /online /enable-feature /featurename:NetFX3 /All /Source: (installation media) :\sources\sxs
Eg : Dism /online /enable-feature /featurename:NetFX3 /All /Source:f:\sources\sxs