Last night I tried installing the City Navigator for South America map pack which I bought, and I left it downloading/installing over night. My PC restarted at night but I see I have less space on my device, so it must have installed properly. What do I do to double check and start using my device in different countries in South America?
This article should help. If not, please, as sussamb mentioned let us know what model of device you have:
How do I check what mapping I have installed on my Camper/RV, dezl, LIVE, nuvi, nuviCam, or zumo device?