Purchased and installed (I thought) the Canada map on my Nuvi 50, but when on the "My Garmin" site, am advised that the Canada map is now ready to download. Checked the unit, and it appears to find the Canadian addresses I punch in. Rather confusing.
According to your myGarmin account the Canada map was downloaded and unlocked to your device already. The Download Now option in your account that is still visible is for re-downloading if needed.