Starting today, September 24, 2018, your UHD 3840x2160 (4K) video downloader has no audio

Yesterday, everything was working fine with your 4K Video Downloader. However, starting today, September 24, 2018, when any YouTube videos are downloaded using your 4K Video Downloader, there is no audio on your .mkv UHD 3840x2160 (4K) picture resolution selection and on your .mkv QHD 2560x1440 picture resolution selection. Your .mp4 FHD 1920x1080 picture resolution selection can still be used to download YouTube videos with both the picture and the sound working perfectly, just as always.