No bootleg found on our show pages should be password protected. I just downloaded this show and it looks fine without password.
Please use a different unzipping tool, it is very likely this is the cause of the password-popup. Try to use WinRAR (rarlabs.com) for instance.
I checked this yesterday and it DOES request a password. I double-downlaoded it to make sure it wasn't a corrupt download and opened with 7-zip and WinRar - no success. The file does indeed request a password. I just chose not to tell anything since it wasn't of any help