Only just seen this thread so apologies for replying now and apologies if I haven't ready everything carefully.
It's as Frances says.
I can log on to my account at xara.com and get my serial number for Eye Candy 4000, then enter that to upgrade to Eye Candy 6 for $99.
I haven't purchased it though.
But I could go as far as the web site telling me that it would be $99.
So, as far as I can see, all you need is the serial number if you purchased the full version of Eye Candy 4000.
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