If you are using Maven, you can use the Maven dependency below and add a repository definition for the Spring by Example Maven repository. Otherwise you can download the jar directly from the Spring by Example Maven repository (http://www.springbyexample.org/maven/repo/).
<dependency>
<groupId>org.springbyexample</groupId>
<artifactId>org.springbyexample.dynamic.tiles2</artifactId>
<version>1.2</version>
</dependency>
<repositories>
<repository>
<id>springbyexample.org</id>
<name>Spring by Example</name>
<url>http://www.springbyexample.org/maven/repo</url>
</repository>
</repositories>