In 2025 you purchased and are now trying to install/use 2018 desktop software? Sorry---TurboTax is no longer providing support or updates for software earlier than 2021. You will not be able to use 2018 software. And...any refund for 2018 has been forfeited for several years. If you owe tax due for 2018 it is still owed with late filing penalties and interest.
You might want to seek local paid tax help to prepare a 2018 tax return. Or..there might be other tax software available for a 2018 return.
What about your returns for 2019 onward? Are you behind for all of them?
Each tax year has to be filed separately using the forms for the specific tax year. They cannot be combined in any way--do not even put them in the same envelope when you mail them. Software for past years is available back to 2021. Any earlier years can only be prepared on paper forms by hand--and those refunds have been forfeited now.
It might be better for you to seek local paid tax help in a situation when you are several years behind in filing your tax returns. Do you even have all of the documents you will need to enter and show your income—like your W-2’s and any 1099’s?
If you need to prepare a return for 2021, 2022, or 2023 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
https://turbotax.intuit.com/personal-taxes/past-years-products/
You may also want to explore purchasing the software from various retailers such as Amazon, Costco, Best Buy, Walmart, Sam’s, etc.
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
