https://files.catbox.moe/dxc3fi.mp4If you want to download from nicovideo in future:
0. get rid of the sp. and go to the www. page
1. right click outside the video, click inspect and go to the network tab
2. right click in the video and click (hls > http)
3. refresh the page and play the video
4. look for a file with the "media" initiator/type with a name that matches the video ID in the url (e.g. sm3638573)
5. right click the file and open in a new tab
6. right click the new tab's video and save as
Bit of a pain in the ass and apparently free users can only get high resolution videos at a certain time of day, but it worked for me
