下载activiti 地址：http://activiti.org/download.html
下载activiti designer 地址:http://activiti.org/designer/archived/
这里我下载的分别是：activiti-5.12.zip，activiti-designer-5.12.0.zip
1、将文件解压到:%myeclipse_install_folder%\MyEclipse 10\dropins文件夹下:(%myeclipse_install_folder%代表你的myeclipse的安装文件夹)
2、在dropins文件夹下新建activiti.link文件
内容为：%myeclipse_install_folder%\\MyEclipse 10\\dropins\\activiti-designer-5.12.0
3、重启myeclipse10
4、OK