I notice from their web site that Deskproto that they have a delayed millennium bug which is potentially going to cause issues:

Delayed Millennium Bug
A serious error has been discovered in both DeskProto V6.0 and V6.1
Due to a bug in the protection software the program can not be started in 2016 or later !
This applies to programs with a Build date (see the About box) before November 2015.
Download your bugfix release at the Buildhistory page.