About those crashes… looks like you are using the 4.8 version from that google drive link (which is outdated) in which case download the latest version from 
If you already are using the version from then it could be because of the destructibles (there is an engine bug that Epic still haven’t fix), in which case remove the destructibles icebergs etc. from the level.
For those trying to compile in 4.9, I will attempt to create a 4.9-compatible branch soon