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Buy now & saveI appreciate the steps that you've taken and the update that you shared, @JohnHoodCPA.
I'd like to ensure that this Unrecoverable Error that you've encountered gets resolved so you can get back on track.
In QuickBooks Desktop Accountant, once your client sent you a .QBX file, you'll need to access and open the file to create a working file (.QBA). This way, you can work and make changes to their company file smoothly.
To give you in-depth information on how to utilize a .QBX file type, please scan through this article: Use an Accountant's Copy working file.
However, to further investigate and fix this matter, I recommend contacting our Customer Care Team. They have the necessary tool that can help isolate the root cause of this problem since it continues after performing the resolution shared above.
Here's how you can reach them:
Please update me if you have any other questions about this or with QuickBooks. I'll make sure you're all set. Have a good one!