I just formatted and installed windows 10, so I also installed ftprush 2.1.8 and mirc 7.43.
I was just looking for a simple invite script like i had before, (like the OP), and found I had to modify what the other posted posted before me to get it to login, invite, and logout. First, get the new rushmirc.dll from http://www.wftpserver.com/bbsres/Rushmirc.dll
which was listed in this post, viewtopic.php?f=9&t=934
Then in alias.ini i added this.
echo -a inviting $1
/dll Rushmirc.dll RushScript RushApp.FTP.LOGIN(' $1 ','',RS_BOOKMARK)
/dll rushmirc.dll RushScript RushApp.FTP.RAW(' $1 ',' site invite $me ',RS_LOGIN or RS_LOGOUT)
I really hope this helps people get a simple invite script working with the latest versions =]