TurboTax does not support tax year 2013.
You may be able to purchase the 2013 software from a reputable online retailer, such as Amazon. However, there is no guarantee that you will be able to receive any program updates or state software downloads.
Go to this IRS website for prior year federal tax forms, schedules and instructions - https://apps.irs.gov/app/picklist/list/priorFormPublication.html
