I'm having a similar issue. I can install the plug-in fine. When I go to activate the plug-in, the instructions say "click below" to activate the plugin. Nothing happens when I click below. I've restarted the computer and then re-downloaded and re-installed the plug-in. Still nothing.
This is the second time in a row that a new plug-in from Slingbox has worsened my user experience. There's no way I'm recommending this product to anyone else now.
I completely agree with you, this site/ product is a joke.
Remember when they had a live help and support team that would chat with you? Now we have to ask each other for help or pay $25/hour. I also really like how your response to my question got a star and a 'correct answer' so they can act like user are getting the answers that they need when we are not.