Oracle or Apple Java™ runtime 1.4 or above (but not newest Java 9, which has not yet been tested).
SVG and MathML support requires using Java™ 1.6+.
100Mb of free disk space.
XMLmind XSL-FO Converter is officially supported on Windows XP/Vista/7/8/10, on Linux and on macOS 10.13 (High Sierra) and macOS 10.12 (Sierra). It is possible to use it on other Java™ 1.4+ platforms, but without support from XMLmind.