Starting with the next release (v4.0.4) I'll be ending support for 32-bit builds of Grid Cartographer. This will affect the Windows and Linux builds only; the macOS build has been 64-bit for all of v4.x.
This decision was made to reduce the time spent creating/testing builds, especially on Linux. Based on market share data showing that less than 7% of Steam users run a compatible 32-bit O/S (http://store.steampowered.com/hwsurvey, March 2017) this should hopefully not impact the majority of Grid Cartographer users.
If you have questions or feedback about this please let me know.
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