wtf is cryptexfixup?

CryptexFixup is a tool that lets older Mac computers run macOS Ventura, even though Apple officially dropped support for them. Starting with Ventura, Apple required a specific CPU feature called AVX2.0, which many Macs from before 2013 simply don't have. This tool works around that limitation so people with older hardware aren't left behind on outdated software. When you install or update macOS Ventura, the system normally installs a package of core files designed for modern Intel processors. However, Apple also maintains a separate version of these files for their Apple Silicon (M-series) Macs, which happens to still support older processors without AVX2.0. This tool tricks the macOS installer into grabbing that Apple Silicon version instead of the standard Intel one, allowing the older machine to boot and run the operating system. This is primarily for people keeping older Macs alive through projects like OpenCore Legacy Patcher. For example, if you have a 2012 Mac Pro or an older MacBook that you want to upgrade to Ventura, this tool helps make that possible. It's also useful for running Ventura as a virtual machine on hosts that lack AVX2.0 support, since Apple's virtual graphics stack still works with these older processors. There are some trade-offs to be aware of. With this workaround, you can't use the small "delta" system updates that Apple normally pushes out, you'll need to download the full 12GB update instead. Rapid Security Response updates also won't work. Additionally, this tool only solves the core booting problem. Some graphics drivers in Ventura still require modern processors, so users with certain older graphics cards may need to find alternative solutions for hardware acceleration.