The original creator/BDFL (Dylan Araps) has been a bit off and on with activity over the last year or so, so the official repository is a bit out of date. The community has kept up to date main and community repos at https://github.com/kiss-community/ though. Come chat with us at #kisslinux on libera.chat!

Also as pointed out in other comments, the main URL is https://kisslinux.org now. Dylan never could seem to settle on a domain name for whatever reason, so there are many dead links, and I don't blame the OP for not finding the most recent one.