Hi jasonblais,
thanks for your reply! Meanwhile, I figured it out by myself and forgot to update my post here. The problem was, that even google search strings like "platform binary mattermost 3.2" are pointing to mattermost 3.6 documentation. So adding a 3.2 CLI reference guide would be very useful I guess.
Thanks anyway - maybe someone else will ran into the same issues like me.
br,
Simon