TikTokDownloader
This app is no longer maintaned. Instead you can try MyTikTokBackup https://github.com/tmk907/MyTikTokBackup
How to download your favorite videos or any profile videos.
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TikTok app: Go to "Settings", "Privacy and safety" and change "Who can view your liked videos" to "Everyone".
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Open your profile page in web browser https://www.tiktok.com/@yourprofile
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Open developer tools (type Ctrl+Shift+I or choose "Inspect" from context menu)
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Switch to "Network" tab.
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On your profile page open list with liked videos and scroll through videos.
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Download har file.
Launch TikTokDownloader, choose download folder and 'Download from har'.
You can close application at any time, next time you open it, only new videos will be downloaded.