@everiste32 and anyone else having ST-LINK driver install issues on Win 8.1:
Please follow the troubleshooting steps in the Getting Started document on page 4 and 5 to force the install.
If those steps did not resolve the issue and Windows cannot find a driver, then from Device Manager, right click the "STM32 STLink" device entry with the exclamation mark and manually point to the driver directory (where the batch file is located).
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