Extract it to a directory of your choice (e.g.: "C:\Program Files\Borland\Delphi\DelphiX"), then open the "Source\DelphiX_for7.dpk" file in Delphi.
In the package window, click Compile, then Install. If you are lucky you won't get any errors .
You may need to manually add the path to the Source directory under Environment Options->Library->Library Path.