So do you get the nice GUI version through purchasing the Acoustica Premium Edition; and a different command line version is the free one?
Acoustica has a GUI for Spleeter. They have a Spleeter add-on as a seperate download on their website. Acoustica has a 30 free trial (Premium). I’m trialing with that.
Spleeter in free but is command line only (if not using Acoustica). Spleeter doesn’t run in Windows it needs a Linux wrapper, this info on the Deezer (creators of Spleeter I think) Github webpage.
Efit: Acoustica has made a Windows addon version for use with Acoustica.