Copyright holders rarely block only YouTube. The same video may be reposted on less aggressive platforms. Search for the title + author on smaller video hosts. Those platforms allow direct downloads via built-in tools.
When a video is "blocked," it is often due to (licensing limited to specific countries) or a copyright strike (the owner has requested its removal). how to download blocked youtube videos copyright
Before attempting to download blocked YouTube videos: Copyright holders rarely block only YouTube
Downloading copyrighted material for distribution or profit is a criminal act. However, many legal experts argue that "personal archiving" or "time-shifting" falls under Fair Use , provided you don't share or sell the file. When is it 100% Legal? You are in the clear if you are downloading: how to download blocked youtube videos copyright