Legal notice: the Include directory is subject to the GNU General Public License, which grants you a number of rights. You may choose not to install it, but it will prevent you from using the TIGCC Library.

To install GTC just extract gtc.exe and the Include directory to any directory. You should add that directory to your Windows path (Control Panel → System → Advanced → Environment Variables, and modify the PATH variable).

Now you can invoke gtc on the command-line, for more information see GTC Command-line options.