IonCube Loader is responsible for managing the license that allows you to run Convention Master.
cd ~/
wget https://downloads.ioncube.com/loader_downloads/ioncube_loaders_lin_x86-64.tar.gz
tar -xof ioncube_loaders_lin_x86-64.tar.gz
/usr/lib/php
(there is likely only one appropriate folder, and it is datestamped). If you followed the installation instructions in section 2, you will be running PHP 7.2 and your command will look like this:
sudo cp ioncube_loader_lin_7.2.so /usr/lib/php/20170718/
ioncube.ini
in /etc/php/7.2/mods-available
and put the following two lines in it (adjust the path to the Ioncube loader as appropriate):
; priority=00
zend_extension = /usr/lib/php/20170718/ioncube_loader_lin_7.2.so
This is the only configuration required for the Ioncube Loader. Save the file and exit.
sudo phpenmod -v 7.2 -s ALL ioncube
sudo systemctl restart apache2
rm ~/ioncube_loaders_lin_x86-64.tar.gz
rm -r ioncube/