QuickBooks error 1603 occurs when a user tries to update QuickBooks but can’t due to damaged QuickBooks backend or corrupted files. Eliminating QuickBooks update error 1603 requires you to work on Microsoft .net framework, resolving the damaged Microsoft MSXML and C++ files, and try installing QuickBooks again. Here are the steps that you can take to eliminate error 1603.
Step 1. Install the QuickBooks tool hub from the Intuit website, except the license agreement, and install it on your system.
Step 2. Now you can open the QuickBooks tool hub, go to the installation issues and click QuickBooks install diagnostic tool. Once you follow all the steps you need to restart your PC.
Step 3. Lastly, you may attempt to update Windows to the latest version to eliminate QB update error 1603.