The unregistered version of Video Edit Magic brands all movies created with a "trial version" tag in the center of the video. After purchasing Video Edit Magic, you need to use the project file you saved to make the movie again. This will create a new video without the tag.

The project file saves all the editing work you did on the timeline so that you can open it later and start from where you left off. You should always save your project so that you can make the movie anytime you want without redoing all the editing.