SAS 9.1
A silent installation of SAS 9.1 needs and installation of SAS 9.1 Java and MS Runtime Components 7 first.
Addition: I was able to figure out how to uninstall SAS 9.1 from command line (documentation from SAS is incorrect). See below.
<package
id="sas91"
name="SAS 9.1"
revision="1"
reboot="true"
priority="0">
<check type="file" condition="exists" path="%PROGRAMFILES%\SAS\SAS 9.1\sas.exe" />
<check type="uninstall" condition="exists" path="SAS 9.1" />
<install cmd="%SOFTWARE%\SAS\sas\setup.exe -s -f2c:\Windows\Temp\sas.log" />
<remove cmd="%SOFTWARE%\SAS\sas\setup.exe uninstall -s -f1%SOFTWARE%\SAS\sas\uninst.iss -f2c:\Windows\Temp\nosas.log -y" />
</package>