See this TurboTax support FAQ for amending a 2014 tax return (desktop or online) - https://ttlc.intuit.com/questions/1971653-how-do-i-amend-change-or-correct-a-2014-return-in-turbotax
If you purchased the 2014 software as a CD from TurboTax then contact TurboTax support for a replacement.
Use this website to contact support - https://support.turbotax.intuit.com/contact/
If you did not purchase the software from TurboTax then you would need to purchase a download of the 2014 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/2014
You must have the tax data file from 2014 to start the amend process using the 2014 desktop program. The tax data file is normally stored in Documents and in the TurboTax folder. The data file will have a file extension of .tax2014
