The QuickBooks Install Diagnostic Tool is an all-time accessible mechanic to QuickBooks software. First, download the latest version of QuickBooks Tool Hub. double tap on the downloaded file and follow on-screen instructions. Agree to the terms and conditions and finish the installation process of the tool hub. Now, tap on the installation issue and select Quickbooks install diagnostic tool. Wait for some time and it will diagnose if there is an error and resolve it.