Since PuTTY version 0.78, the *Private key file for authentication* field has been moved under **Auth -> Credentials**, so please select this to upload the key when using PuTTY version 0.78 and above.
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Click the *Browse* button and the select the `anvil_key.ppk `file.
Click the *Browse* button and the select the `anvil_key.ppk `file.