There are two options.
If you want the Calibre version the latest version is here:
https://www.mobileread.com/forums/sho...&postcount=445
Not everyone is having a lot of luck with it.
The other main version is maintained not as a plug-in but as a standalone Windows application. This is a better version to be honest and it has its own thread here:
https://www.mobileread.com/forums/sho...d.php?t=245754