It include stm32 boot loader file with (mapple mini) driver.
Please go thorugh this link for mapple dirver (usb driver): https://codeload.github.com/rogerclarkmelbourne/Arduino_STM32/zip/794d078de080054ea39095f8980bdcc2de9f3020
For STM32 Flash loader: https://www.st.com/en/development-tools/flasher-stm32.html