You can fix common installation issues of the program with the help of the QuickBooks Connection Diagnostic Tool. These include error codes such as error 1402, 1603, 1722, 1903, etc. due to which you won’t be able to utilize the software functions.
1. Firstly, download and install the diagnostic tool from Intuit’s official website and save it to a suitable location.
2. Next, go to the QBInstall_tool_v2.exe and close all the applications running in the background.
3. Double-click on the file to run it and wait till the diagnosis finishes and then restart your system.