It depends on the mod. If we are talking specific season mods you have to download all the parts (courts, faces, unis, sliders, ROS file etc.) separately and then unzip them into your main NBA 2K11 and Save folder (Roster File, Sliders and settings).
This is the most common way so far, you have to backup your original 2K11 directory, or like people have been doing, create multiple 2K11 folders so that they can play the different seasons and the only thing the must do ingame is load the correct roster.
I'm going to try to make an Installer program for the 1992 Season mod.
P.S.
@ NBA2KMods.com we are trying to come up with this "Starters Pack" that gathers the best of the best of the current NBA. it will include, updated faces, updated courts, updated dornas, global file, ball, unis, latest roster and photomod so you just drag and drop. We just have to figure out what's the best out there based on quality and popularity




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