Is RAL software supposed to run on linux or windows, and is there a detailed version than readme.md file?
Why don't you get ahold of the big man himself and ask him?
Right, so while the software is designed to run on any system which can run PHP5+ I've never deployed it in a Windows environment. Assuming you can install a MySQL DB then it should work peachy, even the install script should run, as it also is also written in PHP.
I've not given the software a ton of love so the process may still be kind of manual; honestly I've never had a use for them so they may as well be un-tested and provided simply as-is. BTW the docs you are looking for are in the docs/ folder. Again they're pretty modest as I don't use the docs and nobody has ever really contacted me about improving them.
Seems the install script uses some Bash-isms to install and configure b8-0.6.2 (for Bayesian-filter spam prevention) and jBBCode-1.3.0 for the BBCode parser. These could probably be moved into another OS-specific script (e.g. Powershell or Bash) as I don't think PHP has much worth as a system configuration tool for moving files around.
... or we could use Perl for this