Please read the following fixes to make 3.0 work on SQL 2012 and 2014, or on Standard Edition (any version):
Version 3.0 shows 0% CPU on SQL Standard · Issue #261 · marcingminski/sqlwatch (github.com)
XES broken in 3.0 does not work in 2012 or 2014 · Issue #259 · marcingminski/sqlwatch (github.com)