If you download the .tar.gz files or the .zip files, just untar or unzip them in any directory. You will see the sironta directory. Go inside and execute sironta or sironta.exe files.

If you can not open the OpenOffice files, try to change the location of the openoffice executable using the Preferences, located in the File menu.

These BETA versions require Java 5 installed (At least). You can download it from java.sun.com.