Mac OS X 10.7 Lion Developer Preview 2 has been updated and is available for download for developers. Rather than being a third preview of Lion, for example, Developer Preview 3, Apple has instead simply dubbed this version “Mac OS X Lion Developer Preview 2 Update”.
From systems that have developer preview 2 of Lion or Lion Server installed, run Software Update and download Mac OS X Lion Developer Preview 2 Update. You must also download Xcode 4.1 Developer Preview 3 available from the Mac Dev Center to build apps with this version of Lion.
If you have not yet downloaded developer preview 2 of Lion and Lion Server, get your redemption code from the Mac Dev Center then proceed to the Mac App Store to redeem your code and download Lion.
The registered developers can download it from Mac App Store. The update is also available on this official link.