The (also known as TrustedInstaller.exe ) is a built-in system service and cannot be downloaded as a standalone installer for modern versions of Windows like 10 or 11. It is responsible for installing, modifying, and removing Windows updates and optional components.

The Windows Modules Installer service (also known as TrustedInstaller.exe ) is responsible for installing, modifying, and removing Windows updates and optional components. When you see "Windows Modules Installer Worker" (TiWorker.exe) in your Task Manager, it is performing essential background maintenance to keep your PC secure. How to "Download" or Restore the Service