The trial version lacks the following:

It includes the following features:

It includes all the features of the Standard version PLUS:

Moving from the v6 trial version to the standard or pro versions is simple. Just replace the ASP files with the ones from the standard or pro versions, and insert the license number given to you after purchase.
If you would like to upgrade an existing 'standard' (or prior version) license to a 'pro' license, please see this kb article for more information.
ShopPower provides a free Data Tool to transition data from older ShopPowers to the latest v6 cart.