Thank you for your fast response.
Without the default I have to use 2 clicks to open Duplicati (right click on the trayicon and then click on Open), but I can live with it. Left clicking on the icon gives no response, so I suspected a failed installation.
Updating without restart is also a little bit tricky in Windows.
I am very happy wih the move to Net8. It’s much faster on my 500 GByte backup (local and Onedrive).