Avoid third-party “driver downloader” websites. Many contain malware or outdated files. Always use the official source.

You are trying to install the 64-bit driver on 32-bit Windows, or vice versa. Run the appropriate dpinst version.

If you have a genuine "ST-EP4" from a specific vendor, check their support page – but 99% of the time, the official ST-LINK driver is all you need.

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