I did some installment sales 7 years ago, and I used Form 6252. Ever since then, TurboTax has imported these when I start my new year. I still have them in my forms list for this year. Only this year the form has been updated and it is now "missing information", which I have no idea how to correctly provide. Thus, can I simply delete the forms? I don't know how they are still relevant 7 years later, but I just wanted to double check before I axe them.