1- how can I convert IP packets into bits on Maple Sim ?

2- How can I simulate SIgtran LAyers (MTP 1 ,  MTP 2 , MTP 3) on Maple Sim ??

I am having problems while installing Maplesim . When i try to Install maplesim on my computer it prepares to install but after it completes then a window appear showing a message that "Please select another location to extract this Installer" .

What can I do ?? I have enough space on my Hard disk !!!

Plzz Suggest something for me !.