How do you do it?
Support gives this helpful hint:
Note: If want to use the Autodesk Network Installation wizard to deploy
AutoCAD LT 2004 Service Pack 1a, you must download and run the Autodesk
Network Installation Wizard patch. For more information about the patch, see
the associated Readme file.
... but doesn't tell you how to do it!
The problem is that sp seems to be for manual update (.exe), not for
patching image (.msp).
Jussi