You seem to be using an old version of Thunderbird. The latest version of Thunderbird requires : Mac: macOS 10.12 or laterIs there any reason why you have not updated first installing version 91 and then install the 102* ?
You seem to be using an old version of Thunderbird. The latest version of Thunderbird requires : Mac: macOS 10.12 or laterIs there any reason why you have not updated first installing version 91 and then install the 102* ?