Not supported from Windows 11 or higher. |

Gigaset QuickSync for fast and easy synchronization between your PC address book and Gigaset handset or desktop base.
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Enabling the .NET Framework 3.5 in Control Panel
You can enable the .NET Framework 3.5 yourself through Control Panel. This option requires an Internet connection.
On the Start screen, type and then choose Control Panel. (To access the Start screen, press the Windows logo key
on your keyboard.)
Choose Programs, and then choose Turn Windows features on or off.
Select the .NET Framework 3.5 (includes .NET 2.0 and 3.0) check box.
You do not need to select the child items for Windows Communication Foundation (WCF) HTTP activation unless you are a developer who requires WCF script and handler mapping functionality.
Turning Windows features on or off in Control Panel 