Yes guys this is the problem that I am facing from quite sometime, after having installed the BlackBerry Desktop Manager for mac I am unable to install any applications on it. Every time I go to install the applications I get an error saying that BlackBerry® Desktop Manager failed to validate your BlackBerry® device update. However this is not the case with many of my friends who are suing the same desktop manager application for their blackberry phone. So what is the case here can you suggest me something here? Please suggest something here.