Run the Diskeeper2011_version.exe and wait until everything is extracted.
Copy the msi file (+20MB) from the local temp dir. (c:\users\%username%\Appdata\local\temp for Win7)
(c:\Documents and Settings\%username%\local settings\Temp for WinXp)
Copy the *.DAL files (your license files) to the same directory.
Create a tranform to siable autoupdate, showerrorreporting etc.. in HKLM\SOFTWARE\Diskeeper Corporation\Diskeeper\UserSettings
To get rid of the What's new message change the Orient value to 0.
Finally run the installer with the following switches.
msiexec /i "path to msi" TRANSFORMS="path to mst" LICENSEFOLDER="path to *.DAL files" /qn (for silent)