You edit the setup.iss file in Notepad. See the entry at the bottom:
QUOTE
[InstallShield Silent]Version=v6.00.000
File=Response File
[File Transfer]
OverwrittenReadOnly=NoToAll
[{51C8741C-4A91-42A6-B6A2-CB891F7398A1}-DlgOrder]
Dlg0={51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdWelcome-0
Count=4
Dlg1={51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdAskDestPath-0
Dlg2={51C8741C-4A91-42A6-B6A2-CB891F7398A1}-MessageBox-0
Dlg3={51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdFinishReboot-0
[{51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdWelcome-0]
Result=1
[{51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdAskDestPath-0]
szDir=C:\Program Files\Kerio\Personal Firewall
Result=1
[{51C8741C-4A91-42A6-B6A2-CB891F7398A1}-MessageBox-0]
Result=1
[{51C8741C-4A91-42A6-B6A2-CB891F7398A1}-SdFinishReboot-0]
Result=1
BootOption=0