Installing .NET 3.5 into newer Windows without Installation Media

Sometimes if you're using older software on newer versions of Windows (ie: Windows 10 or Windows Server 2019), you need to install the .NET 3.5 stack. This is simple to do if you have your Windows installation media - but if you don't, it can be a headache. A simple way around this is to install it using Windows Update.

Simply open up an administrative command prompt and type in the following command:

dism.exe /online /enable-feature /featurename:NetFX3 /all

If you get error 0x800f0954, then it could mean you are using a local WSUS server that does not have this package on it. See my other post HERE on how to bypass (temporarily) your WSUS server.