You can clone with
please put the documenatation into the core-package, as it is possible to download three versions and there is only a documentation for the newest version...
There are a documentation for each version (not for OC 4.0, probably because there wasn't a documentation available on github) if you use the "branch" button:
Sorry I don't understand the question. The documentation in the release is always for the version of the release as it should be. Documentation for other version are available online on our website and can also be downloaded as pdf.
What exactly is the problem?