1 files changed, 17 insertions, 0 deletions

diff --git a/src/WixToolset.Converters/WixConverter.cs b/src/WixToolset.Converters/WixConverter.cs
index c713045e..be09a683 100644
--- a/src/WixToolset.Converters/WixConverter.cs
+++ b/src/WixToolset.Converters/WixConverter.cs
@@ -687,6 +687,12 @@ namespace WixToolset.Converters
                 {
                     xSummaryInformation.Name = SummaryInformationElementName;
 
+                    var xInstallerVersion = xSummaryInformation.Attribute("InstallerVersion");
+                    if (this.SourceVersion < 4 && xInstallerVersion == null)
+                    {
+                        this.OnError(ConverterTestType.InstallerVersionBehaviorChange, element, "Breaking change: The default value for Package/@InstallerVersion has been changed to '500' regardless of build platform. If you need a lower version, set it manually in the Module element.");
+                    }
+
                     RemoveAttribute(xSummaryInformation, "AdminImage");
                     RemoveAttribute(xSummaryInformation, "Comments");
                     MoveAttribute(xSummaryInformation, "Id", xModule, "Guid");
@@ -750,6 +756,12 @@ namespace WixToolset.Converters
                 {
                     xSummaryInformation.Name = SummaryInformationElementName;
 
+                    var xInstallerVersion = xSummaryInformation.Attribute("InstallerVersion");
+                    if (this.SourceVersion < 4 && xInstallerVersion == null)
+                    {
+                        this.OnError(ConverterTestType.InstallerVersionBehaviorChange, element, "Breaking change: The default value for Package/@InstallerVersion has been changed to '500' regardless of build platform. If you need a lower version, set it manually in the Package element.");
+                    }
+
                     RemoveAttribute(xSummaryInformation, "AdminImage");
                     RemoveAttribute(xSummaryInformation, "Comments");
                     MoveAttribute(xSummaryInformation, "Compressed", xPackage, defaultValue: "no");
@@ -1456,6 +1468,11 @@ namespace WixToolset.Converters
             /// DisplayInternalUI can't be converted.
             /// </summary>
             DisplayInternalUiNotConvertable,
+
+            /// <summary>
+            /// InstallerVersion has breaking change when missing.
+            /// </summary>
+            InstallerVersionBehaviorChange,
         }
     }
 }