Studio Instruments Installation - Choosing the Path

This is one question that has been asked a couple of times but has not been answered. I have very little space on my C drive and wish to install Studio Instruments (with its 1.5 GB of multisample data) on another drive. But the installation process does not give me the choice and automatically installs SI on C drive. 

Is there any solution whereby I can install SI on another drive. Help required urgently!