If you are getting Error Code 606, you would need to double check the code you are entering. Be sure that the O is O and not 0 and that no numbers are inverted.
TurboTax error code 606 indicates an invalid license code, often caused by using an online activation code in desktop software (or vice versa), mistyping the 16-character code, or using a version mismatch. To fix this, verify you are using the correct code for the specific software version (desktop vs. online) and re-enter it carefully.