can't install xcode, issue with MobileDevice.pkg I am trying to install xcode on my mac version : Mac OS X Lion 10.7.5 But I'm having a problem,

i download xcode version 4.6.2 from Appstore after i installed the app i clicked on the icon in the launchpad and it just opened and ask me to install device support so i click install and it ask for my password so i entered the pass and it wrote:

An unknown error occurred. See the install log for more details.

so i looked for this problem and i found that i can go to xcode icon, click on the option and click on "Show Package Contents" and than on Contents->Resources->Packages than i click "MobileDevice.pkg", again i entered my password and nothing happend like really nothing, the password is right and i dont know why it is like that

thank you for your help ilan.
I came across this issue in another post but not certain if the errors you are getting are the same but here it is. Source is provided below:

Use Pacifist to install MobileDevice.pkg!!!
Simply open the file with pacifist 
click the top right Lock button that says Not Authorized 
Type your password
and hit install
once thats done install itunes normally
or with pacifist worked great for me

SOURCE:
http://www.tonymacx86.com/general-help/98821-xcode-itunes-mobiledevice-pkg-fix.html