QB Issue Resolution:

Premier Accountant can’t open an Enterprise backup or Enterprise company file.  However, you can get the file converted so you can open it.  Use our BRC Enterprise to Pro/Premier Conversion Service to do this.

Resolution for Issue 'How do I convert a back up copy desktop enterprise to accountants desktop' available: Yes (Solved).
Source: Intuit Community forum.

How do I convert a back up copy desktop enterprise to accountants desktop: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for accountants desktop
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for accountants desktop [Canada]
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Additional Support Options: