[Gimp-user] How obtain & install help locally under macOS?

[Murray Eisenberg <murrayeisenberg gmail com>]

I’ve installed GIMP 2.8.22 under macOS High Sierra (10.13.2) directly from https://www.gimp.org/downloads/ 
<https://www.gimp.org/downloads/> .

How exactly do I…

(1) download the (English) help system for local installation (what’s the exact URL?); and then

(2) install that download into GIMP?  (Is it a .pkg file, or what; if not a .pkg file, what do I do - put it 
where?)

---
Murray Eisenberg                        murrayeisenberg gmail com
503 King Farm Blvd #101 Home (240)-246-7240
Rockville, MD 20850-6667        Mobile (413)-427-5334