Offline installation of .NET Framework 3.5

under Windows 8 Knowledge Point Analysis:
By default, Windows 8 integrates .NET 4.5
8.1 integration with .NET 4.5.1
does not include .NET 3.5 (including .NET 2.0 and 3.0)
Because of system architecture changes, the .NET 3.5 offline installation package cannot be installed directly, and it is necessary to download the data package for installation.
Operation steps:
1. Insert the Windows 8 DVD. The source of this feature was not found in the E:sourcessxs folder. (In this case, E: the user's user has the drive letter of the media on which Windows 8 is loaded.)

2. Open cmd.exe with administrative privileges;
3. Run the following command Dism.exe /online /enable-feature /featurename:NetFX3/all /Source:E:sourcessxs /LimitAccess, then press enter;
After completing the installation of .NET Framework 3.5, you can check that the feature is enabled.