Make sure that SNC encryption is enabled on the AS ABAP.
For more information, see Preparing the AS ABAP.
You want to install SNC Client Encryption on workstations in your landscape. You either have SAP GUI already installed on your target workstations, or want to install both packages later.
SAP does not provide tools for distributing the installation to a number of workstations throughout the landscape. To do so, use your own administration tools or use batch files with the adequate parameters.
You have now installed SNC Client Encryption on your workstation.
Have your workstation users configure SAP GUI to use the SNC protocol.