Thanks for the answer.
My problem, being a newbie, was just not following those steps. After running xlodgen.exe my game does not open on steam or vortex (when I ran it I did not rename it or change the folder, I just ran the program directly from the downloads unzipped in winrar). Then I tried to follow the xLODgen installation steps but the problem persists. I would like to know if there is any way to revert the changes made by running xlodgen.exe to be able to play again without enjoying this mod. Or if there is any way to completely remove the changes made by the mod. Or for example to know if uninstalling the game and reinstalling it would work to be able to play keeping my previous list of vortex mods.
Thanks again.