As for where to get maps, download this document from Bob T. https://www.mediafire.com/file/bz5y4j6vy997hdr/BCN%252C_Orux%252C_Garmin%252C_and_Apple_Map_Plus_Map_Files_and_Instructions_060719.pdf/file
It has step by step instructions to walk you thru the process.
When I setup a new device I download the app (Orux) from google play direct to device. I download all of Bob's files to my PC/Laptop. Then, I plug the device into my PC/Laptop and move everything over that way.