I purchased a copy of Docsmartz PDF to Word converter http:--www.docsmartz.net- . The security system built into the software requires them to re-issue you a new serial number if you need to re-install the software. I recently upgraded my computer and sent an email to request a new registration number. This did not happen. I have emailed them twice more, the second time enclosing the original receipt, both times requesting a delivery and read receipt. On the first occasion it was read, on the subsequent two occasions they were deleted without being read. I am hoping that you might assist me with this matter. read full review »