I would imagine that if you complain to your dealer about your radio, assuming you're in warranty (or have a good relationship with your service center) you might convince them to check for the software update, as a courtesy.
Poster above me is spot-on for maps though. The card gets "married" to your radio/car. If the relationship is good enough you could say you took it out by mistake, thinking it was your SD card with music on it and have since misplaced it. Take note of the first 3 digits of your SD card (these probably match the part number of your head unit) and the last letter(s) after the nine digit part number, these determine the version. Ask your dealer to look up the SD card for your car and see if what ETKA calls out is a newer version than what you have.
If so you should be able to buy it from them and have them set you up. Or if they're really cool let you source it yourself, still need them to set it up for you though. I bought my card on eBay but the seller was a Volkswagen service center in a different state, they just had it cheaper than my local dealer.
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