For our current project we are leaning towards a Silverlight 4 Application installed Out-of-Browser be default on the client machines. Now I am wondering about the best possible approach to get the user to upgrade to a new Silverlight Runtime when our Application makes the switch to lets say Silverlight 5. Please hesitate from responding that we should just push the updated runtime to the clients - we can't since this is an internet project.
Once again, since people seem to misread threads like this, this is about upgrading the runtime now about the Out-Of-Browser Upgrade Behavior which is clear to us.