INSTALL
simply drop the "Mordhau" folder within the zipped folder you download into your root mordhau directory. 
(\steamapps\common\Mordhau)

WARNING
If you have installed a previous version, delete the "GLADIUSASSETS" folder in this directory BEFORE installing new version 
(\steamapps\common\Mordhau\Mordhau\Content\Mordhau\Assets\Weapons\ArmingSwords\SkeletalMeshes)