I have created a simple zen app that uninstalls SPSS 13
msiexec.exe /X{xyz......} /qr ALLUSERS=1 REMOVE="ALL"

I have created a MSI zen app that installs SPSS 15 and added under
'application dependencies' tab the uninstall SPSS 13 zen app

Is there a away to put on the 'Availability > Distribution Rules' tab
for the uninstall SPSS 13 app to check if SPSS 13 is installed before
running so that the user does not get an error message ?

Thank you in advance