The dongle works. I have received the new Dial and tested it again. But I stay with the older Bluetooth 4.0 Dongle, because the range of the new one is ridiculous short. I don't know why the old Dial stopped working and never become alife again.
Some trouble: Sometimes the Elephant Software stops working properly. Double clicking shows the menu, but no curser or mouse action is possible, scrolling is working correctly. It is not a configuration issue. I have test it also in a text editor.
Sometimes the Mouse pointer remains invisible, too and I have to restart Elephant. I am using Windows 10.