Jim, you probably do have version 5 on that CD. I just looked at mine and neither the jacket nor the CD indicates the version. Since you never installed it, you have a one year's update subscription with the CD. You could try to save the free version 5.5 (doubt that is possible) and use it after the expiration of the CD offering.
You may just wanna decide to ask for and receive the key for the freebie and install it; using the registration # the company will send to you in the good email addy that you will need to give them when you apply for it. I think the email you will receive will tell you have to install using the new Reg. #. Good luck to you. I will be only too glad to help, if you will post.