Visit the official Android Developers Platform-Tools page and download the ZIP file suitable for your operating system.
Fastboot works with the bootloader , not the Android OS. It runs before the OS loads. If ADB is like SSH, Fastboot is like a BIOS flasher. android sdk platform tool
To use the Android SDK Platform Tools, you need to have the Android SDK installed on your system. Here are the steps to install the Android SDK Platform Tools: android sdk platform tool
The tools are cross-platform and can be installed on . android sdk platform tool