While the original project is currently unmaintained, you can still find the version 7.0.3 executable (.jar) through several community archives: GitHub Repositories: Active mirrors and forks like Kheltzer/XiaomiADBFastbootTool op07n/XiaomiADBFastbootTools host the 7.0.3 release. Archive Sources:
Xiaomi’s official tool for flashing Fastboot ROMs. It offers a more straightforward approach for ROM installation but lacks the additional management features of the ADB/Fastboot Tools. xiaomi adb fastboot tools 703 download 2021