Hi Drjuliadc, so sorry for missing your post.
Please try the following:
1.
Download the K-Lite Codec Pack (file is 49.1MB).
2. Once the download is finished, open the file and double click on the installer (*.exe).
3. Follow the instructions on the screen to complete the installation. You can skip the "Select Components" or "Select Additional Tasks" screens (leave the options as is).
*NOTE: You don't need to install anything from the "Additional Software Offers" screen.
4. After installing the K-Lite Codec Pack, open or restart Little Reader and check if the videos now play correctly.
If you are still having problems, please let us know at
[email protected].