Fenix 7X Solar, how to download ActiveTopo map?

Hello, can someone explain what have I do to download ActiveTopo map. 

I connected my new Fenix 7x to my PC and used Garmin Express but there is no option where I could see ActiveTopo maps, only basic maps that are preloaded on my device. I checked the internet and saw DCRainmaker video. I disconnected the watch  from PC, configured Wi-Fi and when I want to download map watch said "map download at queue until I plug in the watch". I have plugged it in back to my PC but nothing happened. 

Should I plug it in to the phone charger? What should I do? And why I cant download map without charging device when my watch battery is on 100%?

Tnx