I just want to report the same issue.  But I have NOT installed updates, and rarely do, because I don't want things changing.  I don't use anything that needs updates, just need to get out invoices and track my checking accounts. I have this same issue, QBO file has always needed a manual download and import.  I'm on at least 1 or 2 years back on QB updates and see no reason why a QBO manual import won't work.  Kind of makes me think all imports use an API to check something and , in this case, maybe its blocking the use of the file imports.  If that's the case, Intuit is forcing disabled the use of software we paid for, and that's wrong, just so wrong.  Some of us don't need constant updates for taxes.  

I'm looking into Moneyworks or something else.