Well, your accounting data or files are safe if you encounter QuickBooks error 1904, but if the frequency of occurrence is often, then it needs an immediate diagnosis. Firstly, you will need to download and install the QuickBooks tool hub, and after that, go to the installation issues menu and click QuickBooks install diagnostic tool. This process will take almost 15 to 20 minutes to complete, and after that, you can verify if the error is resolved. However, if you still face the error 1904, you will need to contact the QuickBooks support number to fix it.