I am also getting this - on investigation it appears that cyberpanel.sh is blocking certain IP ranges. In my case they are both in South Africa but on different hosts. If I run the VPS through a VPN and change the IP address to one elsewhere (like Germany) then the installation continues.
However on restart of services the IP address goes back to a South African one and it cannot continue. So am also stuck with this.
One VPS is Alma8 and the other is Ubuntu 20.04, both completely new with updates done.
I can connect fine with wget and curl to https://cyberpanel.net so it appears it is just on the https://cyberpanel.sh domain that I cannot wget or curl from.
Testing on identical VPS hosted in Germany and the UK everything works fine, so pretty sure this is a Geoblock of some kind to the repo