How can I install lightroom cc trial to specific drive?

I have lightroom 5 already installed, but thought I would try (Emphasize TRY) out the CC version since it includes Photoshop CC (still using CS4).  Everything was honky-dorey until it said it wanted to "update" my 5Version to CC.  That's not what I bargained for.  I want to install the trial on a specific drive, but I'm not given a choice of where to install it.  I read all kind of 2013 complaints, but nothing that specifically answers my question about installing the trial version.  Anyone?