Change the offline map download location in Mission Planner

I want to change the offline map download location. How can I change it?

Also, can I download the offline map by copying it to an external hard drive and apply it to the mission planner?

Simply select the area you want to download under flight plan tab, than right click on map → Map Tool → Prefetch. Select the zoom levels you want to save and that’s it!

Sorry, really don’t know…