This is how I resolved the issue on Magellan RM 5202-LM.
# Use only Google Chrome browser (for Windows)
# Register your product and account
# Plug in your device to the computer using the USB cable provided
# Login at https://www.smartgpseco.com/#sign/sign_in
# After login you might see “No device detected” at left bottom corner (I did)
# Click “Update” tab on top left side
# You might see a notification to download a “Plugin” , click to download, note the location folder of the download
# Log off from smartgpscom.com.
# Close all the browser windows (very important)
# Do not detach the GPS unit from the computer
# Double click the downloaded plugin file to install (follow the steps suggested by the installation program)
# Open the browser and re-login https://www.smartgpseco.com/#sign/sign_in
# Now you should be able to see your device in left bottom corner
# If your date of purchase is within three years, you should be able to update the maps
# (Life time map upgrade is valid only up to three years from the date of purchase. Darn, I did not know this).