I have both 4.24 and 4.25 versions, up to date. Have them because my different projects and work require them both. Problem is I can launch anytime 4.24, but when it comes to 4.25 it fails to launch, with error LS-0013. Database for that error doesn’t help at all as it is thought for video games not for unreal engine
I do verify and even reinstall, still the same. The only thing that sometimes works is verifying, restarting PC really fast after verify, and opening 4.25 upon start. That’s 50% success of launch.