When you can not amend your taxes online and TurboTax online asks you do download TurboTax desktop, there is no other way to amend your taxes without downloading state taxes though you don’t need them. The best option is to contact customer support and convince them to help. I called multiple times to explain this finally got one, who helped and ordered state tax for me. This helped to finish my taxes. There is no other way which I know or provided by customer support to exclude or ignore state taxes while amending federal taxes.
