Usually,you can do like this:
A. Unzip the files: *.cpp and other files Into the same directory.
B. From BCB menu, Select File| New: Package.
C. Press Add, and browse to add the unit *.cpp file.
D. Press Compile.If Pass,Press Install.
E. The component is now installed .
F. Save the package.
G.If error in A-F,you can add the directory into tools--Environment options---Library---Library path, try again.
Good Luck!5.1!