Create process() returned 2 error

Hi
I’m learning Unreal for Arch Vis, I have packaged a project I inported from 3dsmax and sent it to my sons computer to test and he can’t open it and gets the error message ‘create process() returned 2’.
I have tried opening a new Arch Vis blank project and packaging that but still get the same error, both the projects work fine on my computer.
I have googled this error but have not found the answer, can anyone help ?
Cheers