SimTree is written in Java and supplied as a Java Archive file (JAR). Thus, one needs the Java Run-Time Environment (JRE) installed in order to use it.
You can get it at http://www.java.sun.com.
Note that the JRE has a default memory size limitation of 64Mb per process. Thus, in order to analyze large structures use the '-Xmx' flag to define a higher limit:
`java -Xmx512m -jar SimTree.jar`
(in the above example '-Xmx' defines a new limitation of 512Mb instead of the default 64Mb).
Comments, suggestions and bugs may be reported to firstname.lastname@example.org