I am the author or RMPrepUSB. There is a new version 2.0.734 on Boot-Land (first hit in Google) - which now supports imaging of USB pens, quick testing of pens, BartPE support and is more reliable .
Please could you refrain from distributing versions of RMPrepUSB your own download links and respect the wishes of the author as requested on Boot-Land. RMPrepUSB is free for private use only and should not be redistributed without permission. If you have any feedback, please feel free to post in Boot-Land and I will try to reply.