I'm having problems with WebOS install on Mac Os X Leopard 10.5.8 .

Pre has been set to dev mode and connected it to the USB. WebOS install jar file is in the same folder as the WebOS doctor jar file. When I double click on WebOS install, the menu appears on the menu bar but then closes. No GUI actually appears. There's nothing in the troubleshooting guide regarding this behavior.

Is there a work around for this?