1. Download Agile MPEG Video Joiner. Install and run it.

2. Add files to be join: Click on the 'Add File' button add the video files that you want to join.

3. Select the output profile: Choose a output profile from the drop-down list in the bottom of the main interface.

4. Specify the output filename: Click on the "Browse" button to specify the output filename. Note that the selected profile should be compatible with the format of the ouput file.

5: Click on the "Start" button

6. View the output videos
After the joining is completed, click on the "Open" button at the bottom of the main interface to browse the output files.