If you go to the Server Behaviors window and click the "+" button. Do you see an option to add WebAssist->MySQLi->MySQLi Recordset?
I was able to open your file and I see the server behaviors. I had to replace some extra line breaks in the file, that might be your issue. You see how every other line has an extra line break? That shouldn't happen and would prevent the server behaviors from reading the code properly.
I've attached a version with the line breaks removed for you to test with.