Here’s a tutorial on how to install Cubase with the bare minimum of components, fortunately SB have made their application quite modular in the sense of installable components which do not have explicit dependencies when installing.
First, download your cubase version, e.g. V9 .zip file and unpack it (I am using a program called Uniextract):
Next find the .msi installer and place it on your desktop:
Then install as per .msi installer: