Sure you can. BUT, before installing the software at the new system, you'll need to deactivate the license at the licensed system that still needs to be running CADhobby license. License deactivation can be done at the CADhobby HELP menu > License Manager feature.

CADhobby only runs on Windows 64-bit systems

Yes, materials can be shipped worldwide, and that includes Italy.

Make sure to install all Windows pending updates and reboot at the end. Also check the installer file provided at the USB flash drive.

Right, you won't loose it.

Correct

No it doesn't. You can uninstall the previous verison, and then install te new one.

CADhobby runs on Wndows 64-bit systems only because, currently, Microsoft Windows PCs still have the major market share in the world.

3D tools are available at the "Draw 3D" Ribbon tab user interface.