No faffing about with zip programs, no hassle.One click in the manager then installs the file into your game and activates it.One click on the site starts your download direct into NMM.It integrates with the Nexus sites to provide you with a fast, efficient and much less hassled modding experience. The Nexus Mod Manager (NMM) is a free and open source piece of software that allows you to download, install, update and manage your mod files through an easy to use interface.