The DHCP MP has now been re-released via http://www.microsoft.com/downloads/details.aspx?FamilyID=c66e88a9-5960-4329-bf6d-f5ca05efd8b5&DisplayLang=en

The previous release (10/26/2006 Management Pack updated, support added for SQL 2005 Reporting and fix included to address “Not Authorized” alerts for Windows 2000 DHCP Servers) contained an error which affected fresh installations of the MP. This has now been corrected.