If you have a Mac that uses macOS 11.x (Big Sur) then please
download Glu-0.4-Mac-BigSur.dmg from here:
Sound support in this build has been disabled to avoid a crash
that only seems to happen on Big Sur. All the scripts run ok;
you just won't hear any sounds.
Hopefully this bug will be fixed in the next release of Glu!
(The crash is happening in the cute_sound library used
by Glu, so it could take a while to find and fix the bug.)
Andrew