And Turbo Tax will only let you reinstall or update the last 3 years. You can not reinstall 2020 or prior. So you might want to leave the old programs installed if you think you might want to open the tax data files in the future to look up anything or amend.
Also if you haven't done it, I would open each year in the program and save it as a pdf file, go to FILE - SAVE TO PDF so you don't need the program installed to view your return. Copy that folder to a flash drive or best yet is to burn it to a CD or DVD and then you will have a backup of them.
