We've had a glitch where people are getting the Evaluation Edition of the CodeWarrior software when they download the Special Edition. The Evaluation edition is similar to the Special Edition, except that it's fully featured for one month. Once the trial period ends, it becomes the Special Edition, with its code size limits. See FAQ-28561 for a little more detail. And no, you don't have to register the software, unless you want to purchase the full features after the temporary license expires.
---Tom