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Modern versions work without requiring deprecated browser applets.
If the v3.1.6 link is inactive, always check the official utilities page for the most recent version, such as DigiGOV_Signer_V4.0 , which may be required for newer eSign protocols. digigovsigner v316exe download link
Uses standard certificates to sign PDF documents securely. such as DigiGOV_Signer_V4.0