NOTE - If you paid for one of the TurboTax 2018 online editions then contact TurboTax support and they can push a 2018 desktop installation file to your download account at no charge - https://support.turbotax.intuit.com/contact/
Otherwise you will need to purchase and download one of the 2018 desktop editions from this website to amend the 2018 tax return - https://turbotax.intuit.com/personal-taxes/past-years-products/
