Workaround for "Invalid issuer of this certificate".

1. Download the Https://developer.apple.com/certificationauthority/AppleWWDRCA.cer certificate, and then double-click Install. General download will be installed automatically after completion.

2. Make keychain the first responder, in the top navigation bar row, select: Show-show expired certificates.

3. Click "Login" and select "All Items" and enter Apple W under the search bar, one of which is invalid, delete.

4. If it doesn't work after the refresh, search (Apple W) several times and delete until the search has no invalid certificate.

Workaround for "Invalid issuer of this certificate".