I'm working with version 126.96.36.199 pro on a Mac Book Pro. I can browse the manual, but can't use the sidebar (the contents and index tabs show the information, but when I click, it refers to ...Downloads/qcad-188.8.131.52-1-demo.macosx.leopard.universal/doc/chapter04.html#absolute zero'). The path that it use is the original folder where I downloaded the demo program.
There is no "com.Qt Assistant.plist" file on my Mac as referred by the FAQ.
I couldn't find any way to change the path for the manual.
I have now all the QCad folders and files on my Applications folder.