Start Quicken and click "File," then "Open." Browse to the new "My Documents\Quicken" folder and select the file with the extension QDF, which is the Quicken Data File.

Click the "Open a data file located on this computer" radio button, and then click the "Select File" button. Browse to the location on your computer where the Quicken file is stored, and then ...

I'm wondering if installing Quicken 2016 or 2017 would convert it back to an app bundle that the newer version of Quicken could open and convert the data. But alas no trial version, just a 60-day ...