Installing the SAProuter 
The following describes how to install SAProuter. On UNIX, SAProuter is installed as a daemon. On Windows it is installed as a service.
Recommendation
We recommend you always install the latest SAProuter.
End of the recommendation.
Prerequisites
For information about the hardware prerequisites see Hardware Requirements for SAProuter.
Procedure
Download
You will find the latest SAProuter in the SAP Service Marketplace 
http://service.sap.com 
SAP Support Portal choose tab
Software Downloads , and then in the left column, choose SAP Software Download Center 
Support Packages and Patches A-Z Index S SAPROUTER SAPROUTER 7.20 .
Installation
How you install the SAProuter depends on the operating system you are using. Choose the appropriate method: