How are 2014 or 2017 relevant to this 2018 question? Why repeat that irrelevant 1899173 link, which I already mentioned and dismissed? Of course I have a newer Mac which I have used for more recent tax years, clearly implied by my mention of my "older Mac." The only reason I used my 10.6.8 computer today was to force the software to tell me what operating system would be required for the 2018 software, which was the question that dustymacaw asked, and thus the only issue that should be discussed here.
