Unzip the contents of the zip file to a folder of your choice. If this folder already contains an install of KirkPack, delete that first. If you placed your KirkPack.jar file to somewhere else, replace it with the one from this zip file.

Note that the KirkPack.jar file can be placed anywhere in the classpath, or you can of course add it to your classpath itself. If you needed KirkPack to run one of my programs, you can place it in the Binaries folder of that program (see that program's installation instructions).