origin: check if installer iss answer file exists

packages/origin.xml

@@ -6,11 +6,21 @@
     <variable name="version" value="9.7" />
     <variable name="short_vers" value="97" />
 
+    <variable name="origin_install_iss" value="%WPKGINSTITUTION%-config\origin\%year%\install.iss" />
+
     <check type="uninstall" condition="exists" path="Origin %year%"/>
 
+    <install cmd='cmd /c "echo %origin_install_iss% not found &amp; exit 1" '>
+       <condition>
+          <check type="logical" condition="not">
+              <check type="file" condition="exists" path="%origin_install_iss%" />
+          </check>
+       </condition>
+    </install>
+
     <!-- N.B. the setup.iss is in %WPKGINSTITUTION%-config because it has serial numbers, licensing info etc. 
          But we keep uninstall.iss in the commonual %WPKGSOFTWARE% because it effectively just says "delete everything" -->
-    <install cmd='%WPKGSOFTWARE%\origin\%year%\setup.exe /s /f1%WPKGINSTITUTION%-config\origin\%year%\install.iss /f2"%WPKGLOGDIR%\origin%short_vers%_install.log"' />
+    <install cmd='%WPKGSOFTWARE%\origin\%year%\setup.exe /s /f1"%origin_install_iss%" /f2"%WPKGLOGDIR%\origin%short_vers%_install.log"' />
 
     <install cmd='cmd /c mkdir "%allusersprofile%\originlab\%short_vers%\license\"'><exit code="1"/></install>
     <install cmd='cmd /c copy /y "%WPKGINSTITUTION%-config\origin\use_server.lic" "%allusersprofile%\originlab\%short_vers%\license\" ' />