perhaps not 100% Answer to your question, but perhaps to your problem.
when I changed from WIN to MAC I also installed an APP called "WINEBOTTLE". It's a tool that makes it possible to RUN GSAK under MAC OS in a special Container. Once installed it is working absolutely without any problems.
But... Being a paying User of GCP ist much more effectiv.... I do not use GSAK any longer....(for my purposes)