What happens is that the JS looks for a file startup-sequence.reb and if it finds it executes it. This gives a table of downloads to renc binaries. Click on a link and it gives you the url to the latest binary for that OS tuple.
Now has pawn promotion, castling and en passant in my Rebol Javascript Wasm chess interpreter
Bo
I was installing R3 on a headless Armbian SBC called SOPine A64 Compute Module, and the standard steps didn't work. This is what I needed to do to get it to work: