If your sister used the license code and logged in with her account you won't be able to use your own account for an additional download.
The information you are seeing regarding each tax return needing their own user ID and password if for the TurboTax online product. You are correct when you stated "From the message, it appears that I have to use the same account to do my own return."
For our Desktop product when using the desktop CD/Download editions installed on your personal computer, just save the return that you are working on and then start a new return by clicking on 'File' at the top left of the program screen and then click on the 'New Tax Return' option.
@mitchchin
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