If you completed the 2014 tax return using the online editions of TurboTax it will be available for download as a PDF from the Tax Home website. If the 2014 tax return is not listed, then either you used a different User ID to create the 2014 tax return then was used for the 2015, 2016, 2017 online returns or you completed the 2014 tax return using the TurboTax CD/Download editions installed on your personal computer. TurboTax does not store online any returns completed using the desktop editions.
Check to see if you have another User ID -
Close all TurboTax windows on your web browser (including this one). Copy and paste the account recovery website link onto a new web browser window and run the tool.
Use this TurboTax account recovery website to get a list of all the user ID's for an email address. Run the tool against any email addresses you may have used - https://myturbotax.intuit.com/account-recovery
If none of the user ID's received will access your 2014 account, then use the option shown in blue on the account recovery website, "Try something else"
