~/Library/ApplicationSupport/endless-sky/plugins.Content/Resources/plugins/ (within the application bundle).%AppData%\ endless-sky\plugins\ which will result in something like C:\Users\\AppData\Roaming\endless-sky\plugins\.plugins\ (in the same folder as the Endless Sky executable).Installing mods is simple: place the folder containing the mod files in a folder labeled 'plugins' in one of the following locations, depending on your operating system.