How to resolve QuickBooks 1603 error code?
There are many possible reasons why QuickBooks Error 1603 appears on your screen. Here are a few of them:
Installing QuickBooks or the Microsoft Installer may be problematic.
Microsoft.NET Framework is also triggered when there is a problem during installation.
This QuickBooks error 1603 can occur when a user is using Windows 10 version of Microsoft OS. The ‘Creator Update’ may be creating the QuickBooks Error 1603.
Last but not least is the possibility that if you are using Windows OS, the error may result from intimidation from Windows Security Policies. you may read here : https://mamafishsaves.com/quickbooks-update-error-1603/