When launching the game, only a black screen was displayed while the video audio could be heard. The issue was resolved by replacing the video files in the /BlueClient/Content/Movies/ directory.

File download link: https://www.mediafire.com/file/mjfmxoib4b8irur/Movies.rar/file

Source of the solution (credit to wmbcmb): https://www.reddit.com/r/inZOI/comments/1jljwlq/comment/mka4wl2/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button