IIS: Make failed MSI installer messages more helpful

Author: victorhora

iis/installer.wxs

@@ -91,7 +91,7 @@
             <RegistrySearch Id="FindInetPubFolder" Root="HKLM" Key="SOFTWARE\Microsoft\InetStp" Name="PathWWWRoot" Type="directory" />
         </Property>
         <Property Id="MSIUSEREALADMINDETECTION" Value="1" />
-        <Condition Message="This setup requires IIS 7.0 or 8.0."><![CDATA[(IIS="#7") OR (IIS="#8") OR (IIS="#10")]]></Condition>
+        <Condition Message="This setup requires IIS 7.0, 8.0 or 10.0. If that's the case, please ensure that the installer is running as administrator or try running it from the 'Apps and features' or 'Add/Remove Programs' menu"><![CDATA[(IIS="#7") OR (IIS="#8") OR (IIS="#10")]]></Condition>
         <!-- Version 2.7.5 had an uninstall issue that leaves some files behind. Asking the user to manually hash this out. -->
         <Condition Message="A older version of ModSecurityIIS was found in your computer. Please complete uninstall by removing the following file: [FILEEXISTS]. You may have to remove ModSecurity module from IIS, use the IIS Manager to do so."><![CDATA[(NOT FILEEXISTS) OR (Installed)]]></Condition>
         <Condition Message="64-bit operating system was detected, please use the 64-bit installer.">