Dear user,

the GUI for the setup is abandoned as of ILIAS 7:

Setup - Abandon web based GUI
Setup - Abandon Maintenance Mode
Setup - Abandon Multi Client

It is replaced by a command line implementation of the setup:

Setup - Introduce CLI-Setup
Setup - Let update-Command change configs

while the functionality for the maintenance mode and the multi-
clients are removed completely as dicussed in the context of
the Setup Revision:

Setup Revision 2018

Have a look into a detailed documentation of the setup in the
file setup/ or take a look into the ILIAS installation
instructions at docs/configuration/

Best regards!