>>je_bai+(OP)
The author seems to be violating the GPL with Menuet64? Menuet64 is pretty clearly a derivative work of Menuet32, which is GPL. However, Menuet64 is released under a non-free license.
Originally I believed the author may be the sole author of Menuet32, and thus could relicense to whatever they wanted. However, the release notes (https://www.menuetos.net/relnotes.htm) credit many other authors with their contributions.