I found some potential fixes for your problem, I will list them :
Unreal Engine 4 won’t open? Here’s how to fix this
- Run the UE 4 as admin
- Disable the antivirus
- Verify the installation
- Reinstall the Unreal Engine client
- Rollback Windows 10
here is a link to the site that has the “in depth” on each step, I highly recommend you visit the site, there is a ton of information on each step.
SOLVED: Unreal Engine 4 won't launch on Windows 10
God Bless you. May Jesus Christ be Charitable unto you.
Acts 10 : 33 - 48, google it, its Awesome.