How do I purchase 2015 premier at a discount?

[DoninGA]

There are no discounts for purchasing TurboTax software for prior tax years on the TurboTax website.

Go to this TurboTax website to purchase, download and install on a personal computer one of the 2015 desktop editions - https://turbotax.intuit.com/personal-taxes/past-years-products/2015/

A 2015 tax return can only be printed and mailed, it cannot be e-filed

The 2015 tax return with a tax refund must be filed on or before April 15, 2019.  After that date there will be no refunds issued for tax year 2015 since it is beyond the three year limit for submitting a tax return for a tax refund.