Thanks, Aaron. I can't solve the problem even deleting REGISTRY.REG. I don't know if it's only an issue of mine or not.
I have even uninstalled the last stable version. I have checked the AppData directory (and the subdirectories named 'Local', 'LocalLow' and 'Roaming') and deleted the 'aarongiles' folder. With everything clean, I have installed DREAMM 3.0b4. Then, the program asked me to search the folder with the games and everything went allright, Grim was installed. But the game keeps being in debug mode. I have push Shift + P and Manny jumps to the end of the game, the Act 4, near the fountain that is like an ashtray. I don't know if I have to delete any other file in any other directory or if it's something that only happens in my computer.