The vast majority of GTA modding tutorials from 2005–2010 are written specifically for Zmodeler 1.07b. Menus, hotkeys, and workflows are unique to this version. Following an old tutorial with Zmodeler 3 would be confusing.
Be prepared for a dated user interface. Unlike modern software, ZModeler 1.07b relies heavily on manual selection modes (like "SEL" and spacebar shortcuts) rather than a modern "point-and-click" GUI. Zmodeler 1.07b Download Free