If you want to experience the renaissance of Roblox gaming, step into the time machine, and you’ll see how we used to do it back in my day (I am not that old; I was like 7 when Roblox released), and ...

This tutorial explains how to download private videos & playlists, or rather: videos you need to be logged in for. I can't guarantee this will work for every service out there, but it for sure works ...