You cannot download WikiAnswers software.
A list of wiki software applications is available here: en.wikipedia.org/wiki/List_of_wiki_software
WikiAnswers is powered by a highly modified version of the MediaWiki software
Anyone can use WikiAnswers that knows about WikiAnswers.
Our code is based on MediaWiki (the software made by the creators/collaborators responsible for Wikipedia). But it has been customized quite a bit, and the more we make changes here the more our software evolves independently.
A Wiki is a website using a particular type of software that allows users to create pages for easy dissemination of information. WikiAnswers allows people to use a Wiki format to get Answers to questions.
WikiAnswers does not run on the MediaWiki platform, and it is not associated with the Wikimedia foundation. WikiAnswers runs its own custom software, that is not at all related to MediaWiki. WikiAnswers is owned by Answers.com, and its software is constantly being updated to deliver the best user experience possible.
WikiAnswers is a website, not a piece of software that runs on your computer. There is no way to access WikiAnswers without an internet connection.
Nobody is compelling you to use Wikianswers.
Maybe your computer doesn't have the right software.
WikiAnswers is powered by MediaWiki; although, the software on WikiAnswers is so customized that it's hardly recognizable as MediaWiki. MediaWiki is the same CMS that powers Wikipedia.
You cannot download the WikiAnswers database. One reason for this is because WikiAnswers is solely an internet resource, and you must use the internet to access WikiAnswers. If you didn't have to use the internet for WikiAnswers, WikiAnswers would not exist.