When you downloaded the map, did you make sure that EVERYTHING that was inside the downloaded folder was placed inside Local Disk (C:)\FeralHeart\Exports?
If this isn't the case then make sure you so that. If you did already do what I just mentioned then try it again and make sure that the .fhm, .fho, .fhs & .fhw. The most important one is .fhm
If that didn't work, make sure your rendering system is set to Direct3D9. It reduces lag and any type of interference that could be stopping you from entering the map. If it isn't set on Direct3D9 then follow this:
Go to Options\Video\Rendering subsystem\Direct3D9
If none of the above have worked, then come back and let me know.