Today we have updated the plugin Automatic Cleanup for Joomla 3 and higher! Install the plugin and publish it right away. After installation turn on Automatic Cleanup in the RD e-Tickets Configuration. It will delete all unfinished orders on every page refresh, it will allmost not decrease the speed of your site if you have enough visitors.
We're always developing our components in the latest Joomla! and PHP environments! No need to be scared to run in troubles when your hosting company is updating their servers. We have probable tested it already ;)