Stop trying to download for free because you won't succeed.
I download all clips with idm.
The site uses a key that changes every x period of time as protection for clips.
The maximum speed goes up to 3 MB/s and if I download an 18 GB clip aka 8h live video, it takes 1.5 h to download it. After it reaches 80%, the speed drops to 1 MB/s.
There are chances that the connection between you and the server will also fail and you've spent 2 hours in vain and done nothing.
Before I bought 1 month of subscription, I had 2 options. I chose the second one thinking that if I also have that download button, the download will go faster.
At first, without using the button, I could download through idm with 17-24 MB/s. After a while the speed dropped below 5 MB/s.
Initially, I did not know why the speed decreased, only after I did some tests.
If we download with idm, the speed drops below 5 MB/s. If we download through that button, the speed increases to a maximum of 10-17 MB/s.
So they changed the speeds to be high only if you have the $30 subscription.
If you have a subscription, it's an advantage that you can watch first and then download, there are some clips that you can't see if you don't have a subscription and you have the possibility of 3 new models for the record.