user21559: I have bought an Arduino UNO that turned out to be the Italian version (Arduino SRL) not the American one (Arduino LLC).
Now when I go to arduino.org and arduino.cc, they both have different versions of the IDE!
So, which one should I use (if they are even different) ?

user21655: You can use both IDEs no matter of the origin of the UNO even fake ones runs with the IDEs.
The arduino.org IDE is just a fork of the arduino.cc.
But arduino.org has many Board which are only run with the .org IDE.

21559: <p>I have bought an Arduino UNO that turned out to be the Italian version (Arduino SRL) not the American one (Arduino LLC).</p>

<p>Now when I go to arduino.org and arduino.cc, they both have different versions of the IDE!</p>

<p>So, which one should I use (if they are even different) ?</p>
 21655: <p>You can use both IDEs no matter of the origin of the UNO even fake ones runs with the IDEs.
The arduino.org IDE is just a fork of the arduino.cc.
But arduino.org has many Board which are only run with the .org IDE.</p>
