Exactly what steps did you take to ensure this?
It’s not possible to investigate this without understanding 1) exactly what you see; 2) what “it” is that is “giving” you this link.
If this “ReplicatorG 0400” is a command-line program, please read the pinned thread to understand code formatting for the forum, and then show us (by copy and paste) what you see in the terminal when you try to use the software. If it’s a GUI and there is no copyable text, screenshots may be useful.
We can help understand how to install Python properly and make the other program use it, only if we know what that program’s requirements are. But I strongly doubt that anyone here has heard of this program, or has any idea what a “GCode” is.