Is there any way I change the install location so I can install it onto my secondary drive?
No, it has to be on the OS drive.
The "official" word as of March 14, 2012 8:56:15 AM
"We (meaning Stardock) discussed this during development but decided not to implement it at this time. Perhaps in a future update..."
See reply #32 in THIS thread. That is not to say it won't be possible in the future, but as far as I know, that is still the case.