Scenarios are installed in a fashion similar to how mods are installed, though there is more variation based on the type of scenario, the engine, and the method of distribution. However, they are still less complex to install than Factions generally are. Please note that scenarios on one engine are not always compatable on others. For example, GAE has a large amount of new Lua functions available, and if those are used, standard Glest may not be able to read the scenario correctly.