You say "most" of your income will be from SS, which suggests also that you will have income from some other source(s). If you have even $400 of self-employment income you still need online Self-Employed, or any version of the CD/download so that you can prepare a Schedule C. Or you might be able to use the IRS Free File site this year:
Use this IRS site for other ways to file for free. There are 8 free software versions available from the IRS Free File site
https://apps.irs.gov/app/freeFile/
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