Hello,
I've just tested CadTools on ZwCAD 2017. To make it work you must manualy enter Cad version and parameter, so in this case ''zwcad.application''. In lower versions Zwsoft used zwcad+ name, since 2017 they droped ''+'' sign. Some functions doesn't work but I can confirm that 85% of them work just fine. Problem ocures when you want to make multiple points/ reapete comands with Cadtools.
They made some modifications in ZwCad2017 and that is the reason why some comand dosen't work (slope and road signs) or they partly work (track offset and station form PL).
Hope this information helps.
rgds.
S.
Info: I made some tests, they must changed something how the polyline is drawn. Problem ocures with comands: Revision cloud, Offset Multiple and 3d (make only one offset, cannot make multiple offset), track station can track only one point, have to reapete command, ...