Beware: Just an FYI. A few people are selling Dongle Software or emulators. This will only work temporarily. It will crash the program and the entire hard-drive will need to be replaced. Sirona software will look for the physical dongle and when it can't find it in the registry it will lock up the software. Great idea to save money, but it will inevitably become a major problem down the road. YOU NEED TO HAVE A DONGLE. Sirona changes the registry key every time they release an update, thus requiring a different registry key that an emulator won't have- leading to system failure. You can delete the registry and reload, but the software recognizes that it has been used illegaly.