You do not say why you cannot download the 2017 software. You are posting your question from a computer using Windows 10. The 2017 software does need to be downloaded to a full PC or Mac, not a mobile device. If you cannot do that, then you could also prepare the return by hand on the paper forms.
2017
https://www.irs.gov/pub/irs-pdf/f1040.pdf
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
https://www.irs.gov/pub/irs-prior/f1040a--2017.pdf
https://www.irs.gov/pub/irs-prior/i1040a--2017.pdf
https://www.irs.gov/pub/irs-prior/f1040ez--2017.pdf
https://www.irs.gov/pub/irs-prior/i1040ez--2017.pdf
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