Open the video on bilibili.com. The URL in the address bar will look like bilibili.com/video/BV1xx... - copy it. If the video has numbered parts (P1, P2...), make sure you're on the part you want.
Open YouTube Downloader and paste the link with Ctrl+V or ⌘+V. The program reads the Bilibili page and shows the video title and thumbnail. For multi-part videos, every part shows up as a separate line in the list.
hoose a format from the dropdown - MP4, MKV, or others. Bilibili typically offers 360p, 480p, 720p, and 1080p. Go with Original MP4 if you want the highest quality without re-encoding. Then press the download arrow or Start all.
Fair warning - Bilibili's CDN can be slow outside Asia, so larger videos may need a bit of patience.
Many Bilibili creators split long content into parts (P1, P2, P3...). When you paste a link to such a video, the program lists all parts automatically. Each one downloads as its own file with the part title in the filename.
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