installed the unzipped folder in ../admin/report and was shown in the Notifications page as;
Ad-hoc database queries /admin/report/customsql Extension 2011121300 To be installed
On installation I get the following error message;
Plugin "report_customsql" (2011121300) could not be installed. It requires a newer version of Moodle (currently you are using 2011070103.03, you need 2011120100).