Did you check what @Magnus said? If not I will explain it:
The cPanel system on where Softaculous is is actually offline, for now. So you can’t install scripts automatically at the moment, but you need to install them manually.
It looks like the main DNS servers of iFastNet are down. Softaculous itself may still be running, but since ifastnet.com and scriptinstall.rocks don’t have working DNS, these domains cannot be reached right now. I’m certain that iFastNet is aware of this and working to fix it.