Most offline distributions pre-inject community skins, arcana items, and terrain maps for free.
Open the console at any point during your local session to tweak the environment variables: -gold 99999 : Grants your hero maximum gold immediately. -lvlup 25 : Increases your hero's level to maximum. dota 2 offline v1014 single link link
Locate the line PersonaName = "Player" and change "Player" to your desired in-game nickname. Most offline distributions pre-inject community skins