If you are getting the message "SlingPlayer cannot connect to your slingbox. Make sure your iPhone is connected to the internet" I would suggest uninstalling and reinstalling the SlingPlayer app. It sounds as thought the update may not have fully installed on your device.
To answer the question about getting an older version of the SlingPlayer app the only way to do so is if you had backed up your applications to the library and still have the older version in your iTunes account on the computer.
Here are some articles that may be of assistance:
- How to uninstall and reinstall SlingPlayer for iPhone and iPad
- How do I revert to an older version of SlingPlayer for iPhone?
Hope this helps!
The Sling Moderation Team - Leanne