I have to agree with a much echoed sentiment here that this application is not up-to-par with the quality of the other PortableApps.com applications--multiple solutions and guessing at numbers isn't "hard" it's just annoying.
Is anyone aware of better alternatives? Maybe a different source we could point John toward in making it portable? I haven't tried many Windows applications for this, but they mostly seem to be not free and not portable.
A couple of excellent, free, and open-source projects I have found for other platforms, both written in JAVA, are: