Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities
一，環境：
SharePoint Online
Win10 + SharePoint Designer 2013
錯誤描述：
使用SPD3013打開SPO站點，然後編輯已有工作流(2013)，報錯：
Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities
二，解決辦法：
重裝操作系統(其實是恢復快照啦)。
重新安裝SPD2013 64位,然後打sp1補丁，然後安裝KB3114337，重啟操作系統。再次打開站點，執行編輯工作流操作，正常了。
三，資源下載：
SPD 2013: https://www.microsoft.com/en-ie/download/details.aspx?id=35491
SPD 2013 SP1: https://www.microsoft.com/en-us/download/details.aspx?id=42009
KB3114337: https://support.microsoft.com/en-us/help/3114337/january-12-2016-update-for-sharepoint-designer-2013-kb3114337
四，參考：
http://www.jrjlee.com/2014/10/server-side-activities-have-been-updated.html
https://www.c-sharpcorner.com/UploadFile/sagarp/how-to-clear-your-sharepoint-designer-20102013-cache/
Server-side activities have been updated. You need to restart SharePoint Designer to use the updated version of activities