The version number you provided (10.13.6) is the final release of High Sierra. There is no version 10.13.136. This guide assumes you meant updating from macOS High Sierra 10.13.6 to macOS Catalina 10.15.x (the immediate successor to Mojave, as High Sierra cannot directly jump to newer OS versions like Ventura or Sonoma on most older hardware).

But this was no simple task; it was a quest that required preparation, the right tools, and a bit of digital magic. Chapter 1: The Ritual of Preparation Before the journey began, the owner performed the sacred