
Here E: is the drive letter of the CD/DVD that contains the Windows installation disk. Write the following command: Dism /online /enable-feature /featurename:NetFx3 /All /Source:E:\sources\sxs /LimitAccess

So, you don’t need to consume any bandwidth if you use the installation media to get the 3.5 framework. Because the Windows installation media itself comes with the version of the framework. It is a strange behavior of Windows 10 and Windows 8/8.1 OS to connect the internet while it requires the 3.5 version of the framework.

NET Framework 3.5 Offline on a Windows Computer

You can install it using your windows 10/8/8.1 installation media. Here I describe two methods to get Microsoft. But, if you are a metered internet user or if you are using a slow speed internet connection, then downloading from the web is not a good solution for you.
