Well...To be brief, here is the mandarin link of the anime

HTML Code:
https://v.qq.com/x/cover/mzc00200no18bci/x0034cvvqvj.html
I am a tencent VIP, so there should be 1080p version. However, I have seen some private trackers manage to get it in 4K format even the tencent video website only has 1080p version. So first I would like to know how to download it - not the resource but the method of downloading the video. To be honest, I would like to view them offline (probably share with the community). So is there a way to get it 4K? Thanks in advance.