Catch up on 2017 & 2018, can I buy turbotax 2017 still?

I am behind on taxes, and now need to file 2017 & 2018.  Can I still purchase Turbotax 2017 Deluxe and use it to file my 2017 taxes?  and then purchase turbotax deluxe to file 2018?

I can find TurboTax 2017 Deluxe on line for $80, but that seems expensive.  I just wasn't sure, if I can still use it to complete my taxes, and mail it in, or if I have to do 2017 by hand.