Launch the HMM, got to settings, select Sonic Generations as the game, click on Install Mod Loader and enable the checkmark at Enable mod loader.The mod manager should find Sonic Generations (or Lost World/Forces) and handle the installation by itself.Run the HedgeModManager.exe (Windows may warn you that it doesn't know the executeable but you can safely click on More Information and then Run Anyway).Download the latest release of the HMM (HedgeModManager), by clicking on HedgeModManager.zip (in Assests).