If you read the plugin page, it clearly states that it is not compatible with the new logging system introduced in Moodle 2.7.
Reading the comments, the original developer also states that he is not able to support & maintain the module any more.
If the problem is as urgent as you say, then I suggest you contact one of the Moodle partners ( https://moodle.com/ ) to get a quote for upgrading the code (possibly including my own employers Synergy Learning).