Just like one can easily download and install any apps or tools on your computer system, similarly for downloading the QuickBooks Install Diagnostic Tool, you also just need to follow a few basic steps and you can have the Diagnostic tool on your machine. Open any web browser, such as Google Chrome or Firefox, and from there look for the QuickBooks Diagnostic Tool. Download it and set up a file on your computer device. Then, save this file on the screen of your desktop, and you are good to go. You have successfully downloaded and installed the QuickBooks Diagnostic Tool.