Mayo, it's easy to see why you thought that - on the home page of the Alsoft site there's a big button that says "Upgrade - $49.99" which doesn't explain that the price applies to those upgrading from DiskWarrior 3, not 4. For those upgrading from 4:
QUOTE
Owners of DiskWarrior 4 version 4.0 will soon be able to download a free CD updater. When available, this free updater will allow you to create a new startup CD containing the updated DiskWarrior application. Please note that the new startup CD will start up the same set of Macs as your current DiskWarrior CD. Your new CD will not start up any Mac that your current DiskWarrior CD can not.
http://www.alsoft.com/DiskWarrior/support.html
