Is there any way to get older version documentation?

I’m using V9.1.0,but I can’t switch the documentation(VTK documentation) version. How can I change the lastest to older version?
What I want to do is Checking the system requirement(Minimum OpenGL version), is there any way to quickly check any version’s requirement?(VTK/FAQ - KitwarePublic) listed V5.2 requirement.

Hmm. I’m afraid we don’t host versioned Doxygen docs for VTK :confused: . Though I don’t think the minimum OpenGL has changed since the “OpenGL2” backend (as in “the second OpenGL backend”, not “OpenGL version 2”) which was VTK 7 or so.

And the Wiki is very out-of-date.

Cc: @sankhesh