Install failed with a lot of errors preventing me even to go to Admin CP.
I was obliged to disable add-on by cmd.php and then immediately delete. The pity thing is I've paid 2 years for 3 website - will try to get the money back.
I had such high hopes for this as I needed more spam protection for XF2. This was easy to install, configure, and the interface for cleantalk was nice. Unfortunately, it didn't actually stop much spam and incorrectly stopped more good posts than bad. I'd gladly pay for the service if it worked for me.