You downloaded ClownBD from here? http://www.clownbd.com/
You do realize that ClownBD has no decryption capabilities at all? You need to decrypt and rip the movie to the hard drive first before trying to use it. AnyDVD HD and DVDFab are the two best choices for decrypting blu ray.
Also, ClownBD cannot compress a blu ray movie, only take sections out. I use it primarily to merge split m2ts files in those blu ray movies that have more than one m2ts file for the main movie (seamless branching).