I love Preachit. I have used it on an older version of Joomla and when I updated to version 2.5 and updated Preachit I can no longer upload my sermon files because they are too large. Wish there was a way to upload something more than 10MB. What audio or video file is less than 10MB anyway.
The upload limit is set by your server environment and your Joomla install and has nothing to do with the Preachit component. If you would like help in increasing this limit we would be more than willing to help through the support structures offered on our site.