Sorry that you are having a hard time installing the Chrome SlingPlayer plug-in..
Just in case you are still having this issue, I thought I would let you know about the desktop software for older Slingbox models.
Here are the links for Windows Desktop and MAC desktop software, depending on which platform you use:
Give one of these a shot to see if you can view your Slingbox without dealing with plug-is.
Hope this helps!!!
Sling Media Moderation Team