Have you recently updated your QuickBooks software and seeing errors popping up? QuickBooks update error 1603 is a general error message that pops up when the QuickBooks software has an issue. It’s a benign error that usually goes away after you restart your computer. However, if you face this error again, it means that there is a larger problem with the QuickBooks software. In this case, it is recommend checking for updates to see if there are any installation issues and then restarting your computer. If it doesn't work, you can uninstall the QuickBooks software and reinstall it on your system to fix the issue.