Help seems to not be working on OS X anymore, instead giving an error when the JavaFX WebView tries to start. Might work only on Oracle’s JDK? Might not ever have worked? Need to investigate.
Worse, the fallback Swing offline version fails to load, due to confusion over the path to the help file having too many forward slashes (most likely).
Verified this is actually 1.29-work-in-progress specific, and cross-platform.