If your own computer does not meet the system requirements to download/install the desktop software for 2018 then you are stuck--you need a computer that meets the requirements. Online preparation is not an option. Perhaps someone -- friend or family member-- will allow you to use their computer to use the desktop software you purchased.
The other option is to prepare it by hand and get the forms and instructions from the IRS and just do it all the old-fashioned way with a calculator and paper forms.
https://www.irs.gov/pub/irs-prior/i1040gi--2018.pdf
https://www.irs.gov/pub/irs-prior/p17--2018.pdf
Form 1040 (2018)
**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.**
