官方網是這樣說的：
https://www.activiti.org/userguide/index.html#springSpringBoot
The following installation instructions are verified on Eclipse Kepler and Indigo. Note that Eclipse Helios is NOT supported.
Go to Help → Install New Software. In the following panel, click on Add button and fill in the following fields:
*Name:*Activiti BPMN 2.0 designer
*Location:*http://activiti.org/designer/update/ 
這樣安裝，由于網絡原因會經常卡死：
第二種解決方案，手動安裝離線檔案：
Eclipse版本：
我本人實驗，驗證過的：
Mac版：eclipse-jee-indigo-SR2-macosx-cocoa-x86_64
Mac版：eclipse-jee-neon-3-macosx-cocoa-x86_64
eclipse老版本indigo-3.7和最新版本neon-4.6，版本解釋見下方：
安裝步驟一：
百度雲：
連結:https://pan.baidu.com/s/1uVbckVTD_puqf0G7x5PXpg 密碼:2rbm
安裝步驟二：
将下載下傳的檔案解壓放到：
notes:
将activiti-designer-5.14.1内的兩個檔案：features和plugins放到eclipse的dropins檔案内：如圖：
将檔案：eclipse安裝activiti需裝eclipse插件20170325的四個檔案放到eclipse根目錄的plugins内：
org.eclipse.emf.transaction_1.4.0.201306111400
org.eclipse.emf.validation_1.8.0.201403111711
org.eclipse.emf.validation.ui_1.7.0.201403111711
org.eclipse.emf.workspace_1.5.1.201306111400
為什麼放：線上安裝時會報：
Cannot complete the install because one or more required items could not be found.
Software being installed: Activiti Eclipse BPMN 2.0 Designer 5.14.1 (org.activiti.designer.feature.feature.group 5.14.1)
Missing requirement: Activiti Eclipse BPMN 2.0 Designer 5.14.1 (org.activiti.designer.feature.feature.group 5.14.1) requires ‘org.eclipse.emf.transaction 1.4.0’ but it could not be found
缺失插件。
安裝步驟三：
上面步驟OK後，重新啟動eclipse就OK了，成功後的效果：