Please pay attention to the filenames, don't try to install the core library instead of the add-on itself, if you did — you'd need to remove it from the Blender user installed add-ons folder. Also note that the add-on and the core library should be of the same version.
Before updating you need to remove the old version and relaunch Blender.
Download the add-on from our site: https://keentools.io/download/facebui...
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https://keentools.io
/ keentools
/ keen_tools
/ keentools
https://vimeo.com/keentools
https://t.me/keentools