You can find all needed downloads and related information in the following list
Agent's & Plugins
Latest Installation & Setup Guide.
If needed follow SAP Note 1031096 - Installing Package SAPHOSTAGENT.
Make sure that you setup the automatic upgrade feature as described in SAP Note 1473974 - Using the SAP Host Agent Auto Upgrade Feature.
Use RTCCTOOL to make sure that all prerequesites are fulfilled
Introscope ByteCode Agent
SCA needs to be deployed to the SAP Solution Manager system, the ByteCode Agent will be deployed
CA Wily Introscope
Software & Patches
Go to "Installations and Upgrades -> S -> SAP SOLUTION MANAGER -> SAP SOLUTION MANAGER 7.1"