AFAIK these so-called "maintenance releases" are just a snapshot of the development tree, and there is no full tarball available for them: it has to be made by mixing this partial tarball with a released tarball.
If you are interested, the port cad/opencascade should be forked to a new one cad/opencascade-devel (beware the conflicts!).
(In reply to Thierry Thomas from comment #1)
You are right no tarball is released, but no "mixing" is needed AFAICT: you just extract it from git.
(Meanwhile 7.6.2 was released).