The 2020.4.0 version of UltraStarDeluxe for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within Games, more precisely General. This free Mac application is a product of Canni.
From the developer:
UltraStar Deluxe is a free OpenSource karaoke game for your PC. The gameplay experience is similar to that of the commercial product SingStar™ by Sony Computer Entertainment, which is exclusively available for the Playstation®. Unlike SingStar™, however, UltraStar Deluxe allows users to create their own songs and sing them on their PC.
You may want to check out more software for Mac, such as UltraStar Deluxe, which might be related to UltraStarDeluxe.