If you have issues with the HMM you can try SonicGMI. Some mods may need a different installation method, which is usually explained in the description of the mod on Youtube, Gamebabana or in the mod folder.To install a mod click on the Add Mod button and select the mod folder/archiveĬopy/drag the mod in the 'mods' folder in the Sonic Generations folder (by default at 'C:\Program Files(x86)\Steam\SteamApps\common\Sonic Generations\').