Shareoint 2013 APP Store添加APP时报错“Everything is fine, but we had a small problem getting your license. Please go back to the SharePoint Store to get t”

Everything is fine, but we had a small problem getting your license. Please go back to the SharePoint Store to get this app again and you won't be charged for it.

 经查证，原因是因为当前登录sharepoint站点是的系统管理员administrator，SharePoint 2013 APP安装时不允许使用系统管理员登录，怎么办，只能换一个账户，可以脆弱的2013，居然没有切换账户的菜单，只是sign out

而找了半天也不知道在哪里可以切换，经过google，找到一篇文章http://corypeters.net/2012/10/sharepoint-2013-sign-in-as-another-user/教我们怎么做，

1、在ie打开此链接

2、右击"SP2013-Switch User"，点击Add to Favorites....

 3、打开SharePoint站点，点击Favorites，点击SP2013-Switch User，然后在弹出对话框输入用户和密码即可。