Download and place the following jars files in plugin folder of Cytoscape (v2.8.3):

CySBGN v1.2 (4.5 MB) - latest version

CySBGN v1.2 depends on CySBML plug-in version 1.2 to support the automated generation of SBGN diagrams of SBML models.

CySBML v1.2 (9.9 MB)

Remove sbml-reader-2.8.3-jar-with-dependencies.jar from plugin folder.

CySBGN is also available in GitHub, Cytoscape App Store and Sourceforge.