The Download.com Installer securely delivers software from Download.com's servers to your computer. During this process, the Download.com Installer may offer other free applications provided by our partners. All offers are optional: You are not required to install any additional applications to receive the software you selected.
From PV Logiciels:
DotNet Protector is a powerful .NET code protection system that prevents your assemblies from being decompiled. Console EXE, Windows EXE and Windows services, you can protect a whole application (main EXE, referenced DLLs) in a single executable file.