Softaculous is accessed over port 2082, which is not a standard port for web pages. If you are having trouble reaching Softaculous, it’s usually caused by access to port 2082 being blocked. That’s often the case on heavily restricted network environments, such as some school or corporate networks.
On a different device and/or network (that’s not restricted so much), you should able to access it. Using a proxy or VPN to bypass the network restrictions could work too, depending on how they are enforced.