If there was a later version of the City Select available than the one that came with your Garmin GPS when you bought it new, then you are entitled to a free upgrade. If it came with the latest software included then you don't get a free upgrade.
Alternative ways to find out the version of City Select are:
1. Login at www.garmin.com as a returning customer using your Registration Code (also known as the Customer Code). You will need this code to upgrade anyway. Here you can find both the exact registration date and the map version.
2. Read what is written on your City Select CD.
3. Start MapSource on you computer and read what is written in the small window in the upper left corner.