EllieHub requires no installation. Just run EllieHub.exe on Windows or EllieHub on Linux/macOS and it should just work.
On macOS, you may face issues with Gatekeeper as I refuse to pay Apple $100 a year just to distribute free software on the Apple Store. Consequently, when opening EllieHub, you may see a pop-up complaining about the application not being signed by Apple and suggesting it to be moved to the trash bin.
So you should go into System Preferences > Security & Privacy > General, and approve EllieHub from there.
Alternatively, you can also disable Gatekeeper.