It all depends on how the application is installed. In most of the cases, simply copy the installation folder to a USB drive and then copy it to the new computer. On the old computer you also have to back up the registry items as well. Go to Start > Regedit > HKEYLocalMachine > Software and locate the Golder's Diary folder. Right click it and choose Export. Save the REG to flash drive and import it on the other computer. The software should be registered.