In fact SIMM installs fine in Scilab 2024.0.0 (by on-the-fly compilation) but you have to install coselica before, as the dependency of SIMM upon coselica does not seem to be set in the metadata of the package.
However, after satisfying this, there is a problem when SIMM loads:
atomsLoad : Une erreur est survenue au cours du chargement de 'SIMM-0.6.2':
exec: error on line #172: "Variable non définie : cos_utils_lib"
S.