FAQ: Q56
Link: http://www.ilopia.com/FAQ/FAQ.aspx?id=56
When I try to install applications (or updates from Windows Update), I get the error message: "A terminal server must be in install mode before you can install a program." How do I install applications or updates?
You must change to install mode before
installing. To change, type "change user /install" (without the quotes)
in a command prompt. When you have installed, change back by typing: "change
user /execute".