my pc keeps going off at every try lunching unreal engine
Is it hot/overheating?
Also, please post your PC specifications.
could also be a lack of power/ underpowered psu. theres also many other things it could be such as memory issues or driver compatibility ( not likely i know but just another possibility).
do post pc specs and let us know if anything happens when it shuts down such as a error message or high usage of certain hardware (cpu, gpu, memory)