Winrpe can be installed silently by using the switches below:

(Pre-5.2.x) Winrpe_x.x.x_Installer.exe /u=user /p=password /S

where user/password specify the service account credentials

(5.2.x or later) Winrpe_x.x.x_Installer.exe /S

You can also specify a new installation directory by the /D switch:

Winrpe_x.x.x_Installer.exe ..... /D=C:\test\winrpe