Awhile back ago, Indy’s live website was moved to a new server and redesigned, but several key pages had not been migrated to the new site yet, including documentation downloads, installation instructions, etc, as I didn’t have any free time to work on that migration.
So, those pages, and the files they linked to, were kept on the old server under a http://ww2.indyproject.org subdomain. That server has recently been taken down permanently by the hosting provider. So, at the moment, any links on Indy’s live website that point to the old http://ww2.indyproject.org site are currently broken.
However, the pages, and the files they linked to, were spidered and saved before the old server was taken down. They will be incorporated back into the live website as time permits, it just has not happened yet. Please be patient during this transition.
In the meantime, an archived copy of the old site is available on Archive.org: