We recommend the command line bot (for Windows/Mac/Linux) or a trusted Telegram bot. Here is the manual method using yt-dlp (the successor to the outdated youtube-dl).
If you prefer not to code from scratch, several reputable open-source projects provide ready-to-use "downloader bots": Youtube Playlist Downloader Bot
Q: Can I download playlists in 4K resolution? A: Yes, some bots like 4K Video Downloader support 4K resolution. We recommend the command line bot (for Windows/Mac/Linux)
Some popular YouTube Playlist Downloader Bots include: Youtube Playlist Downloader Bot