eclipse安装Activiti-designer 所需jar包

eclipse安装Activiti-designer 所需jar包 Cannot complete the install because one or more required items could not be found. Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.18.0.201508100929 (org.activiti.designer.feature.feature.group 5.18.0.201508100929) Missing requirement: Activiti Eclipse BPMN 2.0 Designer 5.18.0.201508100929 (org.activiti.designer.feature.feature.group 5.18.0.201508100929) requires 'org.eclipse.emf.transaction 1.4.0' but it could not be found