I tried uninstalling the old version (v3.2.29.0) before installing the new one => No success, same error message :( I tried to start the service myself, but I can't :( After rebooting the PC, the service was inexisting :(
Typically, this error is a result of an issue with the Microsoft .NET Framework components running on the computer. Try the .NET Framework Repair Tool referenced in our FAQ What should I do if I encounter a Microsoft .NET Framework error while installing or using a Garmin application?.
If you continue to experience this issue, contact Product Support by phone as an agent may need to remotely connect to look at log files to see if they can determine what the issue is.