Getting Started Installing The ST Link
From OpenMBD
The STM32 ST-Link Utility can be downloaded for free from ST Mirco electronics. To be specific:
http://www.st.com/web/en/catalog/tools/PF258168
Once downloaded unzip the executable: ‘STM32 ST-LINK Utility_v3.6.0.exe’ and run it.
Click next until the license agreement screen appears:
After accepting the license agreement in the next screen you can choose the installation path. You are free to choose any installation path. When you click next the application is installed and a new screen appears which allows you to install the driver.
If the program will ask for permission, press allow to install the drivers.
Having done the installation it is now possible to flash the micro controller with the ST-Link as described here