You should be able to access the old class.
When I went to my account, I was able to view the class I bought in 2010. I read somewhere on their website that even the classes that "expired" were now available for viewing.
I contacted customer service to find out how long the time period was, since I couldn't find any reference to timing on their website.
Just log in to your CraftArtEdu account with the email and password you used to purchase your class. You will then be on My Dashboard page and under My Class Library is a listing of your class purchases. They will always be available for you there and just click on View Class to access the class.