Yep, file dont seem to be on server.
I've just fixed an Image link in RgbAdapt thread, PostImage changed link names from PostImage.org to PostImage.cc some months ago, so some of them
(but not all) have gotten broken over time since then.
https://forum.doom9.org/showthread.php?t=170642
here same link to RgbAdapt Graffer
EDIT: No idea how to adjust automatically, maybe get rough settings using grapher, and vary SPow (on each channel identically),
via some Blue:Red ratio, or something like that (no idea really). [EDIT: Vary args In ScriptClip]
EDIT: Maybe try Martin53(AWB) or Bernardt white Balance funcs.
EDIT: Or maybe keep all three channel Spow static, vary Red and Blue RPow as average green channel varies up and down, still no idea.