I too have not upgraded my TurboCAD. It is the last 64-bit version running on Windows 10 I will buy. The only thing I had to change was the TurboCAD finest line widths displays to be seen easily on my 4k computer screens. BTW, Windows 10 comes with a simple 3D CAD app for drawing objects and exporting STL files for 3D printing. It the free Microsoft 3D Builder found under the drop down menu "Windows Accessories".