Found from the installation image: Microsoft-windows-netfx3-ondemand-package.cab
For example: X:\cn_windows_10_enterprise_x64_dvd_6846957\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab
Run cmd as administrator (win+x, command Prompt (Administrator));
Paste the following section and enter (the red part is replaced with the path where your. cab package is located)
Dism.exe/online/add-package/packagepath:E:\cn_windows_10_enterprise_x64_dvd_6846957\sources\sxs\ Microsoft-windows-netfx3-ondemand-package.cab
After the above run is complete, copy the following section to CMD and enter
Dism.exe/online/enable-feature/featurename:netfx3/source:E:\cn_windows_10_enterprise_x64_dvd_6846957\ Sources\sxs\microsoft-windows-netfx3-ondemand-package.cab
Note: The first run may be due to various reasons for slow progress or error situation, no tube, patience to finish. If the error, restart the machine and then re-executed again in order, the basic can be loaded with dotnetfx3.5
This article is from the "Cbird" blog, make sure to keep this source http://benjia.blog.51cto.com/2049577/1872780
Windows 64bit Installation dotnetfx 3.5 Error resolution (memo)