The Download Manager tab and some running downloads This quick tutorial page assumes that you have already installed NMM and have it setup ready for modding. NMM takes care of all of this in the background, which really speeds up the modding process. If you do not use a mod manager you have to manually download and save your files to your hard-drive and then either manually extract files in the proper game directories, or use a mod manager to load the files. = Overview = One of the major bonuses of using the Nexus Mod Manager (NMM) over manually installing your mods is that it makes it a lot easier for you to actually download and install mods off of the Nexus sites. One of the major bonuses of using the Nexus Mod Manager (NMM) over manually installing your mods is that it makes it a lot easier for you to actually download and install mods off of the Nexus sites.