I had the same issue after updating from engine prime1.2.1 to engine prime 1.2.2.
the Install was corrupted.
I would get as far as the pop up to say starting then it would disappear and not actually load.
I had to unistall the software then run Ccleaner which you can get on free 14day trial to clean off all the corrupt install then reinstalled with no issues.
If your updating this could be the same for you, if you have never run engine prime before then I am not sure but sounds like you have corrupt installs.
If you have previously run engine you can back up your library before reinstalling so no work progress like beat grids bpm
s loops and cues are lost.