Your console must be connected to the Internet in order to download the most recent roster. For PC users who want to install it manually, you can download the offline update package below.
Official NBA 2K14 Roster Update 02-09-2014
Links: Download | Mirror#1 | Mirror#2
PC Installation Tutorial: http://www.youtube.com/watch?v=WNoKRvxU9nk
Platforms: PC, PlayStation 3, Xbox 360, PS4 and Xbox One