The CCR has not been actively developed for at least six years. It currently depends on PHP 5, as well as even older components.
PHP 5.6.40, released on 2019-01-10, was the last scheduled release of the 5.6 branch. It is no longer supported.
By the end of June 2020 the Debian release “Jessie” – the operating system installed on the server hosting the CCR – reached its end of life.
Since there haven’t been any further developments, the CCR contents will be made available as a read-only archive, as described in the link. The server hosting the website ccr.chakralinux.org will be shut down.