I hope Fifth hasn't started to do that preinstalled version yet. I've succeded by using the conf files hunvagy gave me. I moved both that directory and the cd contents in separate subfolders in the cdrive directory, which DOSBox uses as C:. Funny enough I can't run the installation from there, after pressing ok, it crashes. But with the directory hunvagy gave me, I was able to run the shadow.exe
which starts the game.