Garmin Fenix 6x plus and Mac OS 10.11.6. El Capitan

Hello guys,

I just got me a Fenix 6x Plus. Everything works fine so far. Managed to drag some maps via Android file transfer to my watch. But now I want to install the maps on the computer in order to get a better performance in basecamp. I already downloaded Garmin express to install the maps. But when I click on the Maps option, to install the maps to the computer, nothing happens.

Do you have any idea on how to solve this?

Thanks and best regards