Can you check Config.xml file in folder where engine is installed.
Your paths to data need to look like something like
 <EditorDataPath>D:\SteamLibrary\steamapps\common\Divinity Original Sin Enhanced Edition\Data\Editor\</EditorDataPath>
  <DataPath>D:\SteamLibrary\steamapps\common\Divinity Original Sin Enhanced Edition\Data\</DataPath>
Incorrect paths will lead to a crash. 
My only guess for now. Editor may just don't work with Windows 10 or something
Last edited by Cadmus88; 24/03/16 04:31 PM.