deni67, that's what it's supposed to say.  When it says "kill the application", it's just letting you know that it's shutting down and anything you have on the screen won't be saved if you have not already saved it.   Once it shuts down, then P8 should recognize your runtimes once you start Poser 8 up again, and then start your XL Library script.   Then you can  use XL Library to browse your runtimes by clicking on the yellow magnifying glass search icon....worked for me and for others.