EDIT NOTE 1/19/2015: The original answer below is for last year 's 2013 return, and does not apply to 2014 product. When searching the forum, be careful you pay attention to the year the answer was for, since things change year to year.
You can talk to TT Customer Support and ask for the downgrade.
When at the support page below, identify your product, then in the search line enter some keywords or question without quotes. On the next page, skip the suggested topic links if they don't help and scroll down until you see two interfaces CHAT or CALL. It should show the wait times for each. When Support is closed, those interfaces will not be active.