The original installation file can be saved to any type of removable device, such as a USB drive. But if you do not have the installation file then there is nothing you can do except to pay for a new download.
To complete and file a 2020 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2020 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2020 tax return can only be printed and mailed, it cannot be e-filed using TurboTax.
