刚装的stata12，运行了一下命令：
net from http://www.stata-press.com/data/mais
net install mais
spinst_mais
目的是为了装上mais，我不知道mais里是否包括了metan命令，我运行了 ssc install metan 后提示如下：
. ssc install metan
checking metan consistency and verifying not already installed...

the following files already exist and are different:
    c:\ado\plus\m\metan.ado
    c:\ado\plus\m\metan.hlp
    c:\ado\plus\l\labbe.hlp

no files installed or copied
(no action taken)
r(602);



然后运行db metan时提示


没有像教程里说的弹出metan命令的菜单模式

求大神指教