Steps for Quickbooks install diagnostic tool exe download– firstly, download Quickbooks install the diagnostic tool and save the setup file in your system after downloading you see QBInstall_tool_v2.exe file in your system now you have to shut down all the apps which are running in the background now double click on the QBInstall_tool_v2.exe file and follow the on-screen instructions then after diagnosing, restart your system. Make sure that you have a good internet connection and stop all the running apps now Quickbooks install diagnostic tool will automatically diagnose all the errors.