Usually found in %appdata%/.minecraft on Windows or ~/Library/Application Support/minecraft on macOS.
If you’ve downloaded the Skyblock 4.11.2.zip file, follow these steps to start your survival journey: Skyblock 4.11.2.zip
While original Skyblock maps (like the legendary v2.1) focused on the core "L" shaped island, the 4.x series often includes modern features such as: Usually found in %appdata%/