Just go to the VV3 download page and click the 'Try it' button. You'll get the latest version, 1.00.4. Then install it over your existing version. It'll pick up your registration key so you'll have the full version.

That's assuming you originally downloaded from the LDW site; if you got the program from a games portal, I suggest you ask them if they've updated the game.
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To err is human; to arr is pirate.