This was tested on Word 2010 on Windows.
Step 1: Download and install the styles (instructions on their website). We still have a problem: the ACM - Name Sequence* formatting does not work (it writes [BO] instead of the ref numbers).
Step 2: Download the extender. Save your doc with the ref style ACM - Name Sequence*. Close Word. Run the tool. Don't forget to re-open the doc and select the style again.