Hi Scott,
here is a link to the main website where you can view the licensing.
http://www.tweaking.com/content/page/windows_repair_all_in_one.htmlI've also uploaded a snapshot and highlighted a key point and underlined it for you
it states that pro licences are valid per major version.
You still have your pro version with the pro features of version 3 , version 4 is a major version update so only the pro features of version 4 are locked but can be unlocked at a discounted price.
if you have any other concerns in this link you will see an email for the tweaking's customer support.
http://www.tweaking.com/core/imprint/index.htmltake care,
Julian