Hello. Thank you for contacting Ummy Video Downloader support team! In order to help you, we'll need some additional info: 1) What's your Ummy version (can be checked in Settings => About); 2) What's the name of your operational system (OS)? 3) Please, send us some links you can't download, so we would check them; 4) Do you have a paid version of Ummy Video Downloader? 5) Optional: send us screenshots of how you download a video;Our user support team will definitely help you once we get this information from you.
Customer support service by UserEcho