Moving from Pc Livemail to Mac w Thunderbird

I’ve been struggling for days trying to change to a Macbook after using Livemail on my pc. I have exported Livemail to a folder on my pc desktop, moved it to an external hard drive and plugged that in to my Macbook. I downloaded Thunderbird on my Mac and am now trying to import the mail file from the external drive. I read that I need the add on for import export which I downloaded on the mac but can’t figure out how to install it as mac doesn’t seem to recognize the file. I need instructions on importing this mail file. Thank you.

Hello Liz. I think the best place to find information on this is the support site:
You can search the help pages and ask questions over there.
Good luck.