Thank you for contacting Slingbox Forum. I am sorry you are having problems with downloads for Slingbox viewing.
It sounds like you need first to update the MAC OS system. The following link will let you see the system requirements for Slingbox to work:
You will want to check this next link to be sure the Slingbox you have will be able to function with the software we need:
Hope this helps you with this issue!
Have a great day!
Sling Moderation Team