GISTIC is one of the important tools in order to get the amplified or deleted regions in copy number variation data. You are giving the required information, and specifying the parameters (I generally preferred the default values), then it gives you the results. Installation is easy, you need to just follow the instructions in Install.txt in this folder.
If you cannot reach this ftp, and don’t have permission for copying files, then most probably you are using Safari; so try another …