I also can't download 1.6, although I am pretty sure that it is included in the sale. If not, then I am sorry for the misunderstanding.
You should be able to download everything including the Dungeon Ravager V 0.1.6 if you purchased the $12 bundle package (Halloween special sale). I will try to solve this problem with itch.io support. But, In the mean time can I have your email address? I will send the link to 0.16 version by email.