plug in an external monitor, make it the primary by moving the little white bar that represents the task bar from the current display to the extended monitor display.
Install the program.
Move everything back.
I have done this, but you will notice that some of the large dialogs DO go off the bottom. If there is a way to scroll the screen to reach them, or move the window above the task bar, that would be nice to know.
Dell mini 9 (white)
Self installed bluetooth service unit
Self installed Super Talent 32GB SSD OSX 10.5.6
Primary apps at the moment: Office, Firefox, Evernote.