解决办法:
32 位系统删除:HKEY_LOCAL_MACHINE\Software\Microsoft\VSTO Designtime Setup\
64 位系统删除:HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\VSTO Designtime Setup\
注:本文转载自:
http://blog.163.com/quan2006@126/blog/static/170228635201291744932953/
http://bbs.youkuaiyun.com/topics/390137517