The 4.7.5 Hotfix is now live! It contains a few critical crash fixes.
If you experience a bug with the 4.7.5 Hotfix, please remember to log a bug report for the issue on the UE4 AnswerHub to the Bug Reports section.
Fixed in 4.7.5
UE-13250 Multiplayer Shootout project sample crashes on start
UE-13274 Projects crashing on launch after converting from 4.7.3 to 4.7.4
UE-11828 HydroErosion on landscape crashes on Linux