https://bugs.winehq.org/show_bug.cgi?id=41242
--- Comment #2 from larry ldc7675@yahoo.com --- (In reply to Bruno Jesus from comment #1)
Hopefully that is some sort of trial key, right?
Your wine version is too old and unsupported, when reporting bugs try to always test in the latest development version of wine (currently 1.9.17) or at least the stable (currently 1.8.4).
I installed 1.8.4 the error has changed to ther serial number is missing or incorrect. please re-install doublecad.
this is a free verison I use in windows for some 2d cad drawings. was hoping to get this to work in wine. I have windows 10 which doublecad works ok in. I prefer using linux mint.
thanks