Having taken a long time to find my way to the ASIAIR PLUS documentation, I agree that the "hidden manual" stuff is ridiculous; I just viewed an ASIAIR PLUS manual page that had only been viewed 313 times, total! They've already put in the time and resources to write the manual -- why hide it, then? Sure, I agree that printed manuals are wasteful, but a PDF version is simple and of course the global standard. Also, it would bring the ASIAIR PLUS into line with the ASIAIR and ASIAIR PRO, which both have normal downloadable PDF manuals. The online Yuque version is hard to find, slow to view, and as pointed out, requires an Internet connection that we don't always have at dark sites. Of course with ASIAIR we usually don't need dark sites, but that's another matter.
