Hi ssf86,
I have managed to license aplus at my home computer. I've started acad aplication as administrator(!!!) and it have loaded aplus correctly and connected to the server.
However, i did not manage to reproduce same result here at work... and i did nothing different that back home.
I don't want to bother you with the issue anymore, just wanted to post my partial success here if anyone or you find it useful.

Thank you for your help these days!