Customization

[Honza572]

Can someone please tell me how I can customize that program?
I mean download speed: it's going quite fast, but I know it could be better because I can play videos at the same time.
Before I was using https://youtubemultidownloader.net/ but it stopped working: it sometimes doesn't even recognize channels and when it does for each video it types "Video Not Found", I could download 20 videos each 20Mbps with no problem, and if there was more it was literally slowing down that router for others at home (so yeah it was using wifi"s "full potential"
can someone please help? (yeah I know that too much speed can lead to being blocked by youtube but there has to be a way around youtubemultidownloader found it.
can someone please help?

PS: yeah I have done a search for similar discussions so either it isn't there or I am blind 😅