The USB drivers are not included in the sony download. If you need them, I have a copy of the CD contents which can be downloaded here
. Please note that the CD contains V1 of the software, you can download V1.1? from the support site listed and use the zip file as the location to find the USB drivers when you first plug in your remote. Have fun.
PS- I prefer my Harmony 550 to this Sony, much easier to program and much cleaner user interface.