How to access the Open-Xchange Report Client in case you have been blocked

You have installed Open-Xchange, but did not yet for whatever reason run
the Open-Xchange report client and now have been blocked.

You cannot access http://software.open-xchange.com/OX6/updates anymore.
But you can still access http://software.open-xchange.com/OX6/stable, because that
is open for everyone.

To solve your problem, just download and install the report client manually from http://software.open-xchange.com/OX6/stable/<YOUROS>/