You're looking for features of the "ANT Video Downloader" native app. Here are some features that I found:
You likely downloaded a "DASH" stream (where video and audio are separate). In the native app, before clicking download, check the box that says "Merge video and audio streams automatically." If the download is complete, use the native app’s "Remux" tool to combine the two files without re-encoding (takes 10 seconds). ant video downloader native app download
In cases where the main site is inaccessible, the developer has provided alternative mirrors to ensure users can still find the necessary files: : Latest Windows Release (v4.18.7). Archive Repository : Older Versions at archive.ant.com. Backup Mirror : AVD-NativeApp-4.18.7 on Dropbox. 2. Installation Steps You're looking for features of the "ANT Video
Install the Ant Video Downloader extension from your browser's official store. In cases where the main site is inaccessible,
Click the Windows or macOS version. The installer is about 30–50 MB.