Potential misunderstandings: The user might be trying to run an MP4 file as an installer, which isn't correct. The installation process for Lilu and Seethrough typically involves using a patcher like oLiu’s Seethrough Patcher. The user needs to know the correct steps, including using the right tools and possibly a terminal command. Also, macOS Sierra is outdated, and support might be limited now. They might not have access to certain tools or repositories.

