All your liked videos are at https://www.youtube.com/playlist?list=LL, and all your liked songs are at https://music.youtube.com/playlist?list=LM .

I would try using yt-dlp. First, download your cookies from YouTube into a file (e.g. youtubecookies.txt). I like the cookies.txt Firefox extension for downloading the cookies.

Then run:

yt-dlp --cookies youtubecookies.txt "https://music.youtube.com/playlist?list=LM"

There are a lot of options to yt-dlp, so you’ll want to look into those.