if you have downloaded the rar 3 package, you don't get an installation 
program.  You may wish to set an executable path by hand.  There are two
steps to this, first adding the programs to the path so the CLI can find
them, and second updating CCIDE so it can find the programs.

1) Adding programs to the path

        The method you use will differ depending on whether you are using
the win95/98/me series or the winNT/2K series.

        For win95 et. all. you would modify autoexec.bat to hold the new
path, for example if you have installed it so the binary directories 
(where the executables are) at c:\cc386/bin you would add a line at the bottom
of the file:
        PATH=%PATH%;c:\cc386\bin

        For windows NT/2K you have to modify the path in the registery.
Run regedit, then select the key 

HKEY_LOCAL_MACHINE/System/CurrentControlSet/Control/Session Manager/Environment

You will see a PATH setting there; modify it by adding your path (e.g.
c:\cc38\bin) to it.  Make sure you put a semicolon between it and the
rest of the path declarations.

After you have modified config.sys or the registry you will have to
reboot the computer.

2) Configuring CCIDE

        Run the program.  Select "file/properties" from the menu.  Select
the install tab.  In the Install Path edit box put the path of the programs
(e.g. C:\cc386\bin).  Exit the program.  CCIDE will put your setting in
the registry.

That is all that needs to be done to set the paths up properly so that
the programs can be found; there isn't really any other installation that
needs to be done after that.
