This is a temporary fix for upgrading from 1.5.9 to 1.6.10 on AWS using Bitnami…
If you do not see an upgrade button on the Admin Console - Config page, then go to
https://your_server_name/web/upgrade to perform an upgrade check.
ssh -i ~/Downloads/awstest.pem email@example.com
(use your own .pem file and dns name)
sudo php /opt/bitnami/php/bin/composer.phar self-update
php /opt/bitnami/php/bin/composer.phar update
clear browser cache and reload DSP root
In future versions this will not be an issue, but for now we will have to manage to go about solving this issue in this manner.