This morning I installed an update to Thunderbird Portable and after "successful" installation it won't open. I receive an error message that reads: "thunderbird.exe can't be found." And yet, thunderbird.exe is shown as existing in the thunderbird/portable directory with a date of 3/8/2021 and a size of 177 bytes. I tried a second reinstallation. Same error message resulted.
Any help on this?