We do not use an installer, but we list system requirements on our website to the best of our knowledge and try to detect hardware limitations on startup. If we detect something, we show a warning, but we can't always determine this.
It looks like the Dell 1545 is fairly old hardware that would struggle with most modern games. I'm sorry that it cannot run on this system, but it's good to hear that it runs on your Mac!
Because it's tied to your Steam account, you can install Steam on any other computer, log in, and access your copy of Universe Sandbox ².