As for as I know, any uploaders who upload their short clips to the Tiktok app most likely should have the original videos.
Get the TikTok video link that you want to download (if you don’t know how to get your download link, read the instructions here).
Go to tikcd.com, and paste your download link.
Click the Download Tiktok Mp4 button.
Download video TikTok to your device.
It's working great.
Via: How to download tiktok video without watermark