Subscription download?

Question

YouTube

I welcome everyone.
Help with the issue. I found a video on YouTube and under the video there is a link to the site with the file I need to download. To download it, you need to subscribe to the YouTube channel.
How can you do the same. With what plugins? scripts?

Here is the same video. The link in the description under the video directs you to download and subscribe.
https://www.youtube.com/watch?v=hQ0zzyx8CGU&list=W...

Answer 1

For example, using the download helper plugin.
With the 4kdownload program - just paste the link.
Subscription in this case is just advertising

Answer 2

This chain of actions is called social. lock. Do I understand correctly?