Missing links in Knowledge Centre

I am trying to get help on the Ruby API. A search in the knowledge centre lists a number of topics, but selecting some of these results in an “Access denied. You are not authorized to access this page” message. This problem has been mentioned elsewhere but does not seem to be generating any significant response.

Here are some of the links I could not access:

“SketchUp Ruby API”, Article 114282
“Technical Reference”, Article 2461867
“Tools menu (Mac OS X)”, Article 114253
“SketchUp Reference Guide”, Article 116008

I suspect there are many more. Where did the articles move to and how can I access them?