I downloaded the samples files for PowerPivot for Excel 2010 (http://www.microsoft.com/en-us/download/details.aspx?id=102) and tried to test its with Excel 2013.For two files, the upgrade from PowerPivot for Excel 2010 to PowerPivot for Excel 2013 worked without problems.But for the 3th, the upgrade cannot be done. There is no error messages. The file is PowerPivot Healthcare Audit.xlsx (attached).
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