Just noticed you posted a fix for the speaker companion smart app. Just tested it and everything thing is working great. As a side note in addition to the previously mentioned smart apps in this thread that work with your DTH. I recently discovered another awesome Smart App for announcements and notifications that works with your device handler, it called Remindr and I highly recommend it. Its probably one of the most powerful notification SmartApp I have personally come across. Regarding installation on Windows, I imagine writing install documentation for it would be very difficult, it seems like there are so many variables. I wish I had documented what I had to do, but I tried so many different things troubleshooting that I gave up and just started googling each error trying multiple things until I could proceed to the next step. It took almost two days to get it working but it was worth it. On the positive side I learned quite a bit along the way and now have an awesome poor mans sonos that works great 
Thanks again!
Link to the previously mentioned, Remindr Smart App which also works with your DTH.