1. First, open the Internet option of the computer browser, select the "Advanced" option in the Internet option setting menu, and find "Allow running or installing software even if the signature is invalid" in the setting window.

2. Secondly, click "Apply" and then click "OK". When finished, you need to restart your computer for the settings to take effect.

3. After the final restart, it can solve the problem that the digital certificate signature cannot verify the identity of the document verifier.