Do you happen to have a log on-hand from the previous version? As far as I know the previous update was also built against Unity 5.3.5f1, so I don't know what could have changed to cause a crash so early on. We did have one build a few updates ago on Unity 5.4.2 (I think?), which was the last version of Unity before they jacked up the Linux minimum spec to OpenGL 3 (PC & Mac were on 5.4.3 for that update). We've since had to downgrade back to 5.3.5f for an issue with the iOS build on 5.3.6+ (long story!)
We do have the last desktop build using Unity 4 on the snowleopard branch on Steam, could you try reverting to that temporarily and uploading the log?