the project still works fine on the custom 4.13 engine just not on any other, i have tried ever version from the moon and back and the only verison that runs is the custom version i have 
i cant even open a single blueprint in any other version
the project still works fine on the custom 4.13 engine just not on any other, i have tried ever version from the moon and back and the only verison that runs is the custom version i have i cant even open a single blueprint in any other version