Turbo tax Standard Online Edition f/Walmart, worked for first return but trying to charge me $20 for 2nd return. How do I fix this?

Turbo Tax was bought at Walmart, Turbo Tax Standard Online Edition.  I have followed the instructions and my code worked for the first return, but is trying to charge me $20 for the 2nd return.  How do we fix this?  The Standard Online Edition should be good for doing 8 returns at no additional charges.