@AnselmD: The plugin is working here. The last error is the problem for you. There was a report last week of a similar problem with Fantastic Fiction using the Import List plugin. The fix was to open the site in either IE or Edge and let the browser download and install the certificate.
The is an earlier error which is a change on the site. But, this isn't stopping the function of the plugin. I'll have a look at this when I have a chance.
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