MyEclipse 2015不能安装Activiti BPMN 2.0 designer插件

MyEclipse 2015 Stable 1.0不能安装Activiti BPMN 2.0 designer插件，插件url：activiti.org/designer/update/
提示错误如下：
Cannot complete the install because one or more required items could not be found.
Software currently installed: Maven Support for MyEclipse 13.0.0.c0000002t201501150359 (component.2063-Axa-9367.myeclipse_maven_module.windows.x86 13.0.0.c0000002t201501150359)
Missing requirement: Eclipse e4 Rich Client Platform 1.3.100.v20140909-1633 (org.eclipse.e4.rcp.feature.group 1.3.100.v20140909-1633) requires 'org.eclipse.osgi [3.10.1.v20140909-1633]' but it could not be found
Cannot satisfy dependency:
From: Maven Support for MyEclipse 13.0.0.c0000002t201501150359 (component.2063-Axa-9367.myeclipse_maven_module.windows.x86 13.0.0.c0000002t201501150359)
To: org.eclipse.m2e.wtp.feature.feature.group [1.1.0.me201501141551]
Cannot satisfy dependency:
From: m2e-wtp - Maven Integration for WTP 1.1.0.me201501141551 (org.eclipse.m2e.wtp.feature.feature.group 1.1.0.me201501141551)
To: org.eclipse.rcp.feature.group 3.6.0
Cannot satisfy dependency:
From: Eclipse RCP 4.4.0.v20140925-0400 (org.eclipse.rcp.feature.group 4.4.0.v20140925-0400)
To: org.eclipse.e4.rcp.feature.group [1.3.100.v20140909-1633]