I have question about licensing. On faq there is answer:
So I would like to check – is it possible to QCAD Professional be started in portable mode as its Trial version?"Licenses are per user, not per installation or system. With one single user license, you may install and use QCAD on multiple computers and multiple operating systems as long as you are the only user. All of our QCAD products give you access to QCAD packages for all supported platforms either through a download area or on DVD."