There you go. I hope it's not an issue that I'm using the file attachment system for the program. I forgot my dropbox password and didn't feel like resetting it =/
If you can't run the program, you may have to download the Hi-Def profile for XNA. It should be free.
Oh yea, to use: Put all xnb files in the content folder. Run the program. All converted image files will be outputted to the (created if not existing) \Output folder. Any errors in conversion will be outputted to the errors.txt file.