kb.altiris.com search for article # 46383 for more details. From the KB:
Deployment Solution 6.9 SP2 can be obtained from http://www.altiris.com/Download.aspx. Deployment Solution 6.9 SP2 is a full product installation and can be upgraded from Deployment Solution 6.8 or 6.9 versions. After installation, be sure to apply all available Hotfixes for this Release.
For a list of supported platforms in this release, see Deployment Solution 6.9 supported platforms and system requirements.
The installation process for Deployment Solution 6.9 SP2 is the same as it was for Deployment Solution 6.9, 6.9 SP1, and 6.8. For detailed instructions, including the minimum rights for the OS and SQL, please see the Deployment Solution 6.8 installation Guide. If you are installing through the Notification Server Web console it is recommended that you apply the Microsoft hotfix link in KB 45832.
When you are performing an upgrade or installing another Deployment Solution version, ensure that you don't have a remote console running. The remote console must be shut down before you try to upgrade or reinstall the Deployment Solution software.