I have recently updated my forum to 3.2 and installed the mod (downloaded today from github)
I used some ancient version before and got some exceptions when activating the mod but after renaming thanks_from to poster_id and thanks_to to user_id in DB, I could activate it.
But now I have no image on the button in proSilver, i.e. it's barely visible.
And clicking it results in:
Catchable fatal error: Argument 1 passed to phpbb\notification\type\base::__construct() must implement interface phpbb\db\driver\driver_interface, instance of phpbb\user_loader given, called in /<...>/forum/cache/production/container_4335734bbdd20f586549a504dff5f80c.php on line 2036 and defined in /<...>/forum/phpbb/notification/type/base.php on line 87
But obviously the "thanks" was accepted properly.