TurboTax does not support a 2014 tax return.
If you are due a tax refund for 2014 it will not be paid since it is over three years from the due date of the tax return. If you have taxes owed the 2014 tax return needs to be filed and the taxes paid.
Go to this IRS website for prior year forms, schedules and instructions - https://apps.irs.gov/app/picklist/list/priorFormPublication.html
Or use a local paid tax professional to assist you in completing the 2014 tax return.
TurboTax only keeps online tax returns for the last 7 years, then same as the IRS 7 year retention on federal tax returns.
