assuming you are using desktop and kept the apps updated, you will need to recreate the returns from scratch. Turbotax does not have copies of the data files when the returns are done using the desktop apps. You'll need to pay any additional taxes since that s specifically excluded under the accuracy guarantee (you get bills for any penalties or interest). you can try to submit a claim if charged penalties or interest but without the original data files, it's likely Turbo tax will deny them
