Loading City Navigator Europe to Garmin Nuvi 350

Here is my dilemma:

I just acquired a Garmin Nuvi 350 from a friend. It did not come with
any software what so ever, only a AC charger and a DC Charger.

I'm planning to go to Europe and have already for the City Navigator
Europe on my PC. I also downloaded the latest Mapsource software from
Garmin, but when i go to install it, it says
"no previous mapsource version found, installation will abort".

So, does that mean that there is a standalone Mapsource software that
i need to get?

Even if i get that software, (or if there is something else that would
work?) how much difficult is it from there to load the City Navigator
Europe software to a SD card?

Any help will greatly be appreciated since we are heading out to
Europe in less than a week.

Thanks,