For Christmas, I received a Slingbox M1. after installing it, I decided to return it for a 500. Since then, when I would start the software, it would list both units. Today, I uninstalled the Slingbox software, thinking I could re-install and would see only the 500 unit but I can't find where to install the software. There doesn't seem to be a place on the website to download the application. The 500 resides with a DirectTV client receiver without a television in that room. Hopefully that will not be a set-up problem. It has been working fine. I've mostly used it when I am away, but no issues when I'm at home as well. Thanks for any help and suggestions.