I just checked and you are correct - the "official" interim wallet has been recently removed from the repo.  I've sent a message to the devs to alert them and remind them about the web link, but it's probably because they are about to release a new version.  I've been running on a later version myself, #1419 in the builds directory, because the devs told me a while back that that version is stable, but you might just want to wait for a new official release.