SP3 download link:

http://manageengine.adventnet.com/products/desktop-central/service-packs.html

How to install:

http://manageengine.adventnet.com/products/desktop-central/service-packs.html#instructions

Important : Take a backup of the Desktop Central installation directory (<Install_Dir>/DesktopCentral_Server) to avoid any data loss during the upgrade process.

1. Inventory enhancements in terms of performance and scalability.
2. Commercial Software Grouping.
3. Remote DB support.
4. AD Reports through E-Mail
5. Re-branding Option to change Desktop Central logo.
6. Improved Action Log Viewer with User Auditing details.
7. IP range introduced in define target.
8. 64-Bit OS Support added for Inventory, Patch Management, Software Deployment and Remote control.
10. MS-Office Patching and service pack installation Supported.
11. Multiple packages support in Software deployment.
12. Reboot policy enhancements.
13. Connect with IP option in Remote Control.