The Jenkins demo is located in
You need Java to run the demo. You also need Cygwin on Windows and the Cygwin binaries must be in PATH environment variable.
The demo folder contains a simple Jenkins job configured to use htf.
First download jenkins.war
Then, on Windows, run
set JENKINS_HOME=jenkins_home java -jar jenkins.war
and on Linux run
export JENKINS_HOME=`pwd`/jenkins_home java -jar jenkins.war
Now you can access the Jenkins web frontend using your browser by opening this link.
Username and password are