Go to http://marketplace.intuit.com/webconnector/ and download the QuickBooks Web Connector by following link "Download and install the QuickBooks Web Connector Version 2.1.0.30".
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Go to "Start\programs\QuickBooks\Web Connector" to start the web connector.
Panel
QuickBooks Web Connector Version 2.0.0.139
Go to http://marketplace.intuit.com/webconnector/ and download the QuickBooks Web Connector by following link "Download and install the QuickBooks Web Connector Version 2.0.0.139".