Your store should be running on Magento Community Edition version 2.0.0 and more.

Note that our Quickbooks Desktop Integration is compatible with all Quickbooks versions from 2015 or later. 

You only need to choose the QuickBooks Web Connector which is compatible with your QuickBooks version and download them at the following link: 

https://developer.intuit.com/docs/quickbooks_web_connector

How to install Web connector ?

After choosing and downloading the Web Connector which suits the QuickBooks version that you used, you need to do these steps:

Installation