Muse Sounds are installed using the Muse Hub application. https://musescore.org/en/handbook/4/installing-muse-sounds
Severity: normal => enhancementVersion: 9 => Cauldron
Muse Hub is only available for MS Windows and Apple OS ecosystem. The equivalent for linux, Muse sounds manager is available as Appimage and prepacked deb and rpm. But there is no sourcecode to find. Additionally i wasn‘t able to find a single linux distribution which ships muse soundmanager. The reason might be the unclear/missing source code situation.
From https://www.musehub.com/eula "You may not publish, distribute,...". Closing as invalid.
Resolution: (none) => INVALIDStatus: NEW => RESOLVEDCC: (none) => davidwhodgins