Go download KiCAD 5.
Also I agree with @330R. Don't use an Uno, they are really big compared to what you can get from the Nano lineup or even a Pro Mini if you are willing to sacrifice the USB port.
Go download KiCAD 5.
Also I agree with @330R. Don't use an Uno, they are really big compared to what you can get from the Nano lineup or even a Pro Mini if you are willing to sacrifice the USB port.