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Thanks for the email. I should have said it is on Thunderbird 45.5.1 that it shows "Not available for Thunderbird 45.5.1"
It would be 5 stars if it can work again like it did on previous versions of Thunderbird.
The strange thing is that I also have TB Portable version 45.5.1 on a stick, and it works perfectly well there... just won't install on the non-portable PC version.