Once in a while, you may encounter an error when you are upgrading your QuickBooks desktop or installing it. QuickBooks Error 1603 is one such error that you may face. At the time of updating or installing QuickBooks, this error befalls and the user of QuickBooks Desktop Pro, Premier and Enterprise are the major victims of this error. Here, you will learn how to fix QuickBooks error code 1603. Call on QuickBooks customer support phone number to get the unlimited service.