Hi,
In Microsoft Deployment Toolkit (MDT), the "Windows Pre-Application Installation" stage is a phase in the deployment process where you can perform tasks before installing applications and drivers on a target computer.
The "Post-application installation" stage. This stage occurs after the core operating system, applications, and drivers have been installed on a target computer during the deployment process.
If the "Windows Pre-Application Installation" stage is causing issues or conflicts with one of your applications, and you can achieve the same results by customizing the application deployment itself or using a "Post-application installation" stage, you might consider disabling it.