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When you install Q Mac 2018 on the computer with Sierra, you will be able to access the file from Q Essentials and convert it into a Q Mac 2018 file.
If you insist on continuing to use the old obsolete Q Essentials you will have to restore your Mac OS to the old version you had before the upgrade.
@MichaelY No, I don't work for Quicken; I'm just a Quicken user trying to help fellow Quicken users. You obviously have an agenda to bash Quicken here, and I'm not likely to change your mind.MichaelY said:Dear friendly Jacobs. You must work for Quicken! Guess I lost track of who owns who -- sorry for the incredible gaff. I am guessing that the Quicken tech could have convinced me to buy the new Quicken software and I could have easily ported my data there without worry. But he did not... Instead he freaked me out into thinking I had lost my data or had to find an old OS to re-establish it. Seems like bad support to me... I vote with my wallet!