Hi Laszlo,
I think this Note is not relevant.
I had installed on an NON-SAP Windows 2008 R2 Server, the saphostagent 7.20 package and register with the Transaction RZ21 in CEN. Without errors. It works fine, but always the Agent go in status "offline" for a few minutes(see in TA RZ20).
Thanks Laszlo for your help.