Instructions
Right-click the downloaded .zip "Enemy Territory" modification you wish to install.
Select "Extract All" from the pop-up menu.
Type "C:\Program Files/Enemy Territory/ETMAIN" into the "Files will be extracted to this folder" field. If "Enemy Territory" is installed on a drive other than the C drive, enter that drive letter instead.
Click "Extract" located in the lower right corner of the extraction window. The files are now extracted to the "ETMAIN" folder.
Launch "Enemy Territory." The kill sounds during the game should now reflect the sound pack you installed.