Can you Install two different TurboTax Premier CD on the Same Computer?

Before buying a second Premier CD for another Family Member that was going to be installed on a Family Computer I Googled whether it was Possible /Allowed  saw a note that yes I could.  Now with the new CD in drive, seems as if not possible .  

 

Can you actually install a second Premier CD on computer?  

 

Guess I could uninstall old CD and replace with 2nd CD license.  

 

Anyone else have success or answer??

 

Thanks all