Regarding TurboCAD 18.1 update.
The advice from John R does not seem to be accurate as when I did what he advised the 18.1 upgrade refused to proceed because it said that there was no program installed to upgrade. I therefore conclude that I must now reinstall the original 18 and upgrade it.
However it is a moot point since I am abandoning 18 due to it being unusable.
At the time of that I posted my statement, it was true, the download was the Full Program. I just now checked and it is a "Patch" file (51.2MB). For that to work, one needs to have version 18.0 installed to use that. A big problem I find is that the management at IMSI/Design no longer mentions what to do with what has been posted or what it is that has been posted (patch or complete program).
Good luck with a different CAD program, as I'm sure the company behind it will be better run than the way IMSI/Design is.
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1903), 64-bit