Any suggestions for installing 2014 to cut down on clutter from older versions but still keep all of the styles etc.

1) I can either install to the prior directory

OR

2) Install to a new directory, but then I probably need to install styles that came with the 2013, and possibly older versions etc.
Since I keep all of the Sound Files in a separate partition, that will not have to be moved at least. What files need to be installed from prior versions? How to avoid overwriting a newer version of the same file?

Any suggestions from someone who really knows the program really well, and perhaps just gone through the install ?

Thanks !