Buy Upgrade 2007 => 2006

how can I buy the upgrade form 2007 => 2007 ?

On the 'Macecraft Software online shop' I cannot find the option for buying upgrades.

Klaus

Sorry

of course I mean upgrade 2007 ==> 2008

Klaus

Here's the link: http://www.macecraft.com/eshop/jv16powertools2008-upgrade/