Guys, unfortunately I am convinced that it's not possible to upgrade from the free 2010 version to the 2011 version for the reduced price of $5.95.
The website says:
"Remember: If you have purchased any version of jv16 PowerTools, RegSupreme Pro or RegSupreme, you can update to jv16 PowerTools 2011 with just $5.95!"
I have made the word "purchased" bold, underlined and red because this word is most important: you must have "purchased" a previous version, not obtained it for free!
What's more: when you want to buy the upgrade, you must enter the email address you used with your previous order. So, if you downloaded the previous version for free, you don't have a previous order at all and obviously you didn't use an email address for a nonexistent order.