Hi John (Nadar),
The link provided by Ambarish is a very good resource, as is the Note that Manik Reddy provided (
1365123 - Installation of Diagnostics Agents). See the Agent Strategy attachment on that Note.
At the site from Ambarish is a key Note, 1833501 - Diagnostics Agent - Installer Versions. It contains vital information and the link to http://service.sap.com/sltoolset. There you'll find a very nice matrix containing info for the SUM and SWPM tools; be sure to scroll to the bottom for the table on resources to download.
FYI: I just recently used 70SWPM (SP6) to install SMD Agent 7.42. It was on HP-UX IA64 64-bit and the installation incorrectly had a "-i" option on the "useradd" statement, which is not valid for HP-UX (per manpage) so I ended up having to manually create the SMD user da1adm as root at the Unix level and was then able to complete the installation via 70SWPM. I sent a message to SAP to let them know about this.
Jim Cleek
HP Enterprise Services
SAP Basis Support