Two versions are available here for download.
RiscLua 7 requires an ARM processor with VFP, and so is not suitable for RiscPC or Iyonix. This version has the Lpeg library built in. Its arithmetic uses 32bit integers and 32bit VFP floats. It is based on Lua 5.4.0(work 2).
RiscLua 5 uses only 32bit integers. Being compiled with the Acorn C/C++ compiler, without the Lpeg library, it is more compact, and is perhaps better suited for scripting with StrongED or as the engine for data-handling applications. It is based on Lua 5.2.2.