I've completed 0.9b version. Great game, I enjoyed it a lot! I'd really like to face the new announced adventures (Institute, Goblin King, and so on...)
How can I do to get 0.9c? Is it a way to upgrade 0.9b or need to run a complete 0.9c download?
0.9c is only a bugfix of 0.9b, which is final content. 0.9c is posted here in the OP
Goblin King Ending and Institute Ending are in 0.9b and 0.9c.You start them by giving Irith the Spider Amulet (see walkthrough)