Recently YouTube starts to update the algorithm of VEVO videos downloading up 3 times per week in order to protect these videos from downloading. Other downloaders require reinstallation in order to be able download VEVO Videos again. 4K Video Downloader doesn’t require this action and updates the code part automatically once YouTube generates the new algorithm for VEVO downloading. Usually 4K Video Downloader developers fix it quite quickly but it can still takes few hours.
To sum up, if you have some issues with VEVO downloading from YouTube, please wait a bit till we fix it.