Check the requirements before trying to use WebSVN.
You can find archived versions of WebSVN on the tigris.org download page.
Access subversion repository
You can also access the subversion repository directly. The repository is located under http://websvn.tigris.org/svn/websvn/, the username is 'guest' without a password. The stable releases can be found in the folder 'tags', whereas 'branches' and 'trunk' contain unstable development versions. Uses these versions only in a trusted environment!