Some of this documentation is shipped with Outgun, starting with version 1.0.0. The documentation here on the web is fresher and more complete so, when you are online you should prefer the pages on the web.
At the moment, all of this documentation is for Outgun 1.0. All the online documentation available for Outgun 0.5.0-E can be found starting from the 0.5.0-E page and the Brazilian website (in Portuguese). Some of the documentation here also applies to older versions, but what applies is not marked in any way so you’ll just have to try.
Most of these pages have been translated to Brazilian Portuguese by Paulo Nascimento. The translations are available in the tutorials section of the Brazilian website. Take note of the date of original there, not to read outdated information.