A screenshot of the error would be helpful, if you don't mind sending it.
1 year ago(+1)
Inside your game folder "Engine\Extras\Redist\en-us\" run a file called 'UE4PrereqSetup_x64.exe' it will install all the necessary files.
1 year ago(+1)
I can't find that file. After opening Engine folder I have only 2 folder named "Content" and "Binaries"
1 year ago(+1)
Wait till the next update, it's coming soon. It will contain everything you need to launch it.
I solved it by downloading DirectX from here: https://www.microsoft.com/es-ar/download/details.aspx?id=35