You can get the old player from Cnet: http://download.cnet.com/SlingPlayer/3000-2139_4-10573277.html
Make sure NOT to click yes when asked to get newer version when installing. If you do so you will only get re-routed to the online player.
You know the issue that the older version of slingplayer keeps asking to check for update when you start it. Well, this is easy to stop.
Search your pc for SlingPlayer.ini It is buried away under application data folder, but is in different locations depending on you running xp or 7. But the file name is the same. You need to enable search for hidden files in order to find it.
Edit this file using notepad (not a word processor) and you will see a line that says "checkforupdatesonstart=1". Change the 1 to a 0. Save the file. Next time you run the slingplayer, it will not look for updates.