折腾了好几天，用Windows Server 2012 R2安装 SharePoint Server 2013都没装上去。最后发现必须安装带SP1的SharePoint 2013，不然那一步IIS永远过不去。
好吧，上手折腾workflow
发现平台只有 SharePoint 2010,2013里Workflow Manager 1.0要另装的，参见
http://technet.microsoft.com/en-us/library/jj658588(v=office.15).aspx
重新上服务器装Microsoft Web Platfor Installer 4.6,搜索 Workflow Manager 1.0,搜到的都装了。
装完还不止，还要打开 SharePoint 2013 Management Shell
运行 Register-SPWorkflowService –SPSite "http://url" –WorkflowHostUri "http://url:12291" –AllowOAuthHttp
终于粗线了