@: I wanted to be sure that my projects are not faulty. For reason I created a completely new project with version 4.91 (+Starter Content). I enabled VXGI and HBAO+. Nothing more. Then I started the package process. I get the same error as the last times. (UE4 game binary is missing) Unfortunately seems to be a bug in the current build. 
Perhaps an incompatibility with Windows 10?