Where is UMG in version 4.3.1?

i can’t find umg in ue4.3.1
how can i find it?

You need to run the engine executable with ‘-umg’ (the Editor executable not the launcher). After that when you create a new blueprint, you will have a new item called ‘Widget Blueprint’ under ‘User Interface’ section

In 4.4, you will need to enable it in Experimental section in Editor settings

There is no engine executable with '-umg’

-umg is a command line parameter.

Create a shortcut to the editor executable. Right click on the short-cut and choose properties. In the command text box, append ‘-umg’ (without quotes) at the end. Double click the shortcut