If you have not entered any data in the 3.1 version on your new computer. Open UFT and make a new project. Enter yourself as number one person. Do a saveas and name the file ZeroData.sqz. Now how ever you transfer files copy those on the old system to the new one project to project, library to library, image to image.
Or make a .sqz file on the old one and copy it to the new one and open there.