Pun intended. Here's a link to a procedure that may let you install the Mapsource update:
It only involves downloading and installing files that Garmin makes available for free. I have not tried it (in my case, a modification to the registry convinced the update file that it should install), so I can't promise it works. But it doesn't look like it could do any harm.
It worked for me. I now have POI's on my c330.
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