Hi there, cjvezeau.

I appreciate all the efforts you've exhausted just to get this working. At this point, I'd recommend contacting our technical support so we can further check your account and investigate the issue. Since you're unable to open your QuickBooks product anymore, you go to this link to connect with us: Contact QBDT Support Team.

Once you're in, just select QuickBooks Desktop from the drop-down menu and click Continue. Then, enter a brief description of the issue you've encountered.

In case you need some resources while working with your books in QuickBooks, you can browse some topics from our Help Article page.

I'm just a comment away if you have any other concerns or further questions. Take care.