Get your taxes done using TurboTax

Can you take me step by step: 
Where do I need to log in?  Then enter my TurboTax license code? Then download my software? 

I purchased the TurboTax Deluxe Download or CD at Costco and would very much like to exercise the "Download" option.  Every time I try, I end up on the Online version with it wanting my credit card. 

 

Thanks in advance for any assistance.