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You can download the installer here
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You must have the QuickBooks Web Connector installed. The QuickBooks Web Connector is a software application that runs on Microsoft Windows that enables specially designed web-based applications to exchange data with QuickBooks products. Please note the QuickBooks Web Connector (QBWC) is typically installed when QuickBooks is initially installed on the server. Please verify as some IT professionals may not perform a full install.
Kindly click the link below for instructions on downloading and installing the QuickBooks Web Connector:
https://developer.intuit.com/docs/0200_quickbooks_desktop/0100_essentials/quickbooks_web_connector
It is preferred that the QuickBooks Web Connector be installed and be running on the users workstation. If you are installing the web connector on the users workstation you must also have your IT professional configure Port 443 (or Port 80) on your server https://smartadvocate.atlassian.net/l/c/BkHN739r
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