QB Issue Resolution:

Only if they used the 2014 accountants edition. If they used a different edition, then it is not compatible.

Resolution for Issue 'The accountant cannot open/work with the Accountant’s Copy file(.QBX). Is the QuickBooks Pro 2013 version compatible with that of 2014?' available: Yes (Solved).
Source: Intuit Community forum.

The accountant cannot open/work with the Accountant’s Copy file(.QBX). Is the QuickBooks Pro 2013 version compatible with that of 2014?: 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 copy file
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Error Recovery for copy file [Canada]
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