My first question is why I was not able to update via the Dashboard – either through the automatic prompt to update the plugin or by uploading the .zip file. But actually, that’s been resolved in this particular case because when I logged in just now, the update notification was there and the update was successful.
I did the process as you’ve described via FTP last night when I originally posted this message and it wouldn’t transfer the files for some reason. It’s all working fine now, but I am wondering if I will encounter this problem again when it’s time to update.