Rapture Install Link

Hi all
 
Does anyone know if there's supposed to be an Install Link against Rapture?
 
There's a serial no and registration code for it listed immediately beneath X2 in my account details but is not downloadable on its own. Neither is it obvious (to me, at least) if it's part of the X2 download or, if it is, which part of that download it is included in - which makes it difficult to try to reinstall without overwriting the whole of X2...
 
As ever, any helpful suggestions gratefully received.
 
Thanks
 
Dave