Select the "Song Library" tab, enter the mkv music name in the search box, then select "Liguang KTV Library", click "MV Search", and all searched MV resources will be listed below. Click to select a music to download.

After clicking, some detailed information of the song will be displayed on the interface, and then click on the location shown in the picture below to download the song.

After clicking, a download task box will pop up to set the storage location of the downloaded songs. After setting, click the "OK" button.

You can see the current download progress under the "Download" tab,