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context.ctan.zipis the archive that will be uploaded to CTAN. It contains all the other zip files, as well as all the files in a “flattened” format that is easier to browse on CTAN. -
context.tds.zipis the TDS-compliant archive that contains all the runtime files used by ConTeXt. You can install this by simply unpacking it into a TEXMF tree, although it is better to use your TeX distribution's package manager. -
context.bin.zipcontains the binaries necessary to run ConTeXt. To use this, unpack it, and then copy the subfolder appropriate to your platform into your$PATH. -
context-nonfree.tds.zipcontains the non-free files that can optionally be used with ConTeXt. This is not included in the standard TeX Live distribution, but can be installed by unpacking it into a TEXMF tree. -
context-legacy.tds.zipis the TDS-compliant archive that contains all the runtime files used by the now-obsolete MkII version of ConTeXt. -
luametatex.src.zipis an archive that contains the C source code and cmake build scripts used to build the binaries contained incontext.bin.zip.