Some 404's after upgrade

The last version fixed all my clock issues and I appreciate it. After the upgrade to 2.0 I started noticing some 404 errors.
The strange thing is I get only few 404’s a day while having hundreds of visitors daily.

Exemplary log:

404 URL: https://paleosmak.pl/wp-content/plugins/top-10/top-10-addcount.js.php?top_ten_id=1249&activate_counter=11

Referred by:

User Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)

https://www.ads-software.com/plugins/top-10/