Users - how to shut them down

I am searching for help in how to shut down 2 users in the Sage Production (Version 18.40) on Windows (Version 10).

We have two users which are “old” machines and it seems that SAGE was not closed properly. As we have only 10 licenses and when more than 8 users try to login at the same time, it says it is not possible.

Anyone knows how to shut them down??

Olga Dias