You can download Groowiki precompiled binaries, javadoc documentation, and source.
DOWNLOAD FROM sourceforge.net
The best way is to download the code from sourceforge.net.
For the release 2.0.0 we currently do not provide preconfigured windows installation. This is because the version 2.0.0 and above need not be configured to start a demo/try setup. All you need is to setup Java, Tomcat, download Groowiki WAR and deploy it to you Tomcat installation via the Tomcat manager web interface and click on the opening page of the servlet.
To get a detailed description how to install Groowik in production environment visit the online documentation
The file groowiki-x.y.z-preconfigured-windows.zip contains a Tomcat 6.0.20 with Groowiki preconfigured so that all you need is to try groowiki to extract it to c:\growiki and double click the C:\groowiki\bin\startup.bat. For a more detailed description how to start the preconfigured trial visit the tutorial. You will see description and screenshots.