It is not possible to file a 2015 tax return using DIY software. You would need to use a tax professional in your area to assist in completing and filing the 2015 tax return.
If you expect a refund for tax year 2015 it will not be paid. It is beyond the three year limit from the due date of the tax return for a refund.
If you are a US citizen or legal resident you are required to report your worldwide income on a federal tax return each tax year.
TurboTax supports tax years 2022 thru 2019.
