Nevermind, I found what is changed in v5.4:
Latest version: 5.4 Released on Jan 9, 2023
Improved: Due to the latest update of the YouTube algorithm, VideoProc Converter has been adapted to ensure that users can download YouTube content successfully.
Added: The support for downloading 4K and 2K WebM videos with audio.
Fixed: The problems that the download failure of oversized videos and the download content was incomplete.
Fixed: Some minor bugs.