In a Visual Studio Setup/Deployment project, the Launch Conditions Editor is where you specify prerequisites — such as requiring a minimum .NET Framework version, a specific OS, or a registry/file/component check — that must be satisfied before installation proceeds. It lets you add a 'search target machine' condition (e.g., check for .NET Framework 2.0) tied to a launch condition that aborts setup if unmet. The Registry Editor only manages registry keys to write, the File System Editor lays out files to install, and Required Components Editor addresses merge-module dependencies, none of which handle pre-install version gating like Launch Conditions does.