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I had this issue, and what I noticed was Fab was only installing the plugin into the Appdata directory.
Go to <C:\Users\[username]\AppData\Roaming\Maxon\Maxon Cinema 4D 2025\plugins\>
Copy the ‘Fab’ folder
Paste it into <C:\Program Files\Maxon Cinema 4D 2025\plugins\>.
Then relaunch Cinema 4D and try exporting from Fab.
I´m having the same issue, but this didn´t work for me