Mac OS X (old): ZS-MacOSXold-SA-T2023-06-11-1120.zip, downloads as an application bundle named ZereneStacker (.app).
This bundle is not self-contained. It requires a Java runtime environment installed by Apple, and will prompt for installation of Java if one is not already installed. It runs as 64-bit where the processor and operating system support it, and as 32-bit otherwise.
Length 8,677,776 bytes
MD5 checksum 77937463f00ad82e28ccd1af857d3d92
SHA-1 checksum 7f61e201af98d8362cdc9e45786a4ba6a002f38f