The standard installation of ArgoUML already comes with several modules which add e.g. support for C++, php and C# code generation. In some cases, you may want to add even more functionality by adding a third party module. To make this possible, you first need to download the module.

Unpack the downloaded file in the same directory as you unpacked ArgoUML itself.

The result should be that the directory that contains the argouml.jar file, now also contains a subdirectory named ext, which contains the .jar files for the extra languages.