good afternoon . I download the folder and pass it to my servitor. I execute it but at the moment of launching the server I do not see the folder oxide and when checking in the console "oxide.version" I get "Command 'oxide.version' not found" will I be doing something wrong? I hope you help me

That means you do not have Oxide installed. Make sure that installing Oxide is the last step you take after updating your server, and that you are not updating it again with SteamCMD on startup.