The latest QuIDDPro binaries will be provided free of charge upon request (except for certain geographic regions) for non-commercial use only --- send email to quiddpro@gmail.com. In your request, please provide your name, affiliation, and (optionally) possible uses for QuIDDPro and/or reason for interest.
If you would like to receive email updates about the release of new versions of QuIDDPro, please send an email to quiddpro@gmail.com and ask to be put on the QuIDDPro Updates mailing list. You will not be spammed on this list as it is used infrequently, and the email addresses kept in the list are not available anywhere online.