I have tried to import the file to Livesplit but it tells me that the file is not renewed, I do not know, if a Guide is necessary for that.

Make sure you've followed all the required steps:

Download the script and place it in a convenient folder. Launch LiveSplit. Edit layout and add Control -> Scriptable Auto Timer. Double click on it, click Browse... and navigate to a folder where you put it. Don't forget to save your layout and to have separate layout files for every game.

Now I understand it, thank you very much, I'm sorry, it's my first time doing a speedrun and I didn't know how to configure that, thanks.