ImportExport NG - Vintage - where to download

Did install Thunderbird 45.8.0 (yes, it’s vintage) on my Mac today. Found the download page for the plugin “IImportExport NG”. But only for newer versions of Thunderbird.
Where to go to find the vintage plugin I need?

Best Regards

P.S. sorry for posting in “DeepSpeech” but choosing a category did not work on my smartphone

ImportExportTools NG Version History

Thx. Found that Page to, but the oldest software on that page is “Works with Thunderbird 60.0 - 73.0”
But I am using 45.8.0

Update to version 60?

Operating Systems

Mac OS X 10.9
Mac OS X 10.10
Mac OS X 10.11
Mac OS X 10.12
Mac OS X 10.13
Mac OS X 10.14

I am using Mac OS X 10.8