The bug you found on the Bitnami Support Tool should be fixed now on latest version. Thanks for reporting it.
Regarding your issue, could you share the output of running the commands below? I would like to take a look to the permissions configuration on the plugin directory.
ls -la /opt/bitnami/apps/wordpress/htdocs/wp-content/
ls -la /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/
Could you also share the Apache Error Log? You can find it at
/opt/bitnami/apache2/logs/error_log and send it to me to
Finally, what is the content of your .htaccess file? Could you paste the content?