Problem :

QBXML components have not been installed. /  Error Getting Version / QODBC Requires API version 1.1 or 2.0 to communicate with QuickBooks

Reason :

There have been a few problems reported when Upgrading to QuickBooks 2013 R7.

After auto update/manual install of QuickBooks 2013 R7 version, QODBC/QuickBooks SDK reports an error on connect.

This is basically because the SDK files are not updated correctly.

Please do refer

QuickBooks 2013 R7 Failure

QuickBooks 2013 QBXML Components have not been installed

Solution :

Apply the Critical Fix from Intuit:   http://support.quickbooks.intuit.com/support/Articles/SLN74717

Alternative: Re-install QuickBooks.