[wp34s owner's manual v3.3 pdf] could it be free for download?

[EdS2]

One can include documentation in a software package, and the whole can be licensed under the GPL. And I believe that's the original situation here. At some later point, after 3.0, W sought to pull the documentation out of the GPL coverage. The present state may well be that the documentation is no longer GPL.

BTW I have no issue with people seeking reward for their work, whether as payment, sponsorship, or donations. Even dual licensing can be used this way.