Subscription won't upgrade Quicken 2015 for Mac file

I have one account I use Quicken 2015 for Mac. After OS upgrade (not sure which one as I don't access this account very often) the software opens briefly and shows the register, then crashes.
I have a subscription license as well and use for my main accounts on Windows. I installed the latest Quicken (5.14.3) for Mac and now trying to convert file but it crashes with "An error occurred during persistent store migration".
I did all the steps (the file is not corrupt per the check) in this link to no avail. (
I need help either to get Quicken 2015 to run and export or for the file to convert to the subscription.


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