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The current production version of Zerene Stacker is Build T201404082055 (April 8, 2014), as follows:
Mac OS X: ZS-MacOSX-SA-T201404082055.zip
, downloads as an application bundle named ZereneStacker (.app).
This bundle runs as 64-bit where the processor and operating system support it, and as 32-bit otherwise.
(Length 4044937 bytes, MD5 checksum 45f096eab0a95bafabc916f64183e252)
Yosemite users will probably prefer to use the new self-contained Zerene Stacker package available in beta HERE
The new package avoids any need to load legacy packages from Apple.
See the modification history for description of changes.
The most current beta testing version can be downloaded HERE.
Previous production versions are still available in the downloads archive.