I'm migrating an installer from InstallShield to WiX v4 with Bundle and having issues with minor upgrades. Here's my scenario:

Current Versioning Scheme:

• Format: x.y.z.a where:

  • x = major version (static for minor upgrades)

  • y = minor version

  • z = usually 0

  • a = build version

• Minor upgrades occur when any number except the major version changes

• Major version changes result in a separate installation with different upgrade/product codes

What I've Done:

1. Decompiled InstallShield MSI to preserve GUIDs and components

2. Created WiX MSI project with proper versioning

3. Created Bundle project to package MSI with prerequisites

The Issue:

The minor upgrade functionality isn't working as expected. Here's my configuration:

Product.wxs (msi project)

<Package
Codepage="1252"
Name="$(var.ProductName)" 
Language="1033" 
Version="$(var.ProductVersion)"
Manufacturer="$(var.ProductManufacturer)" 
UpgradeCode="$(var.UpgradeCode)"
ProductCode="$(var.ProductCode)"
InstallerVersion="200">

<Upgrade Id="$(var.UpgradeCode)">
    <UpgradeVersion Minimum="$(var.InitialVersion)"
                    Maximum="$(var.ProductVersion)"
                    Property="PREVIOUSVERSIONSINSTALLED"
                    IncludeMinimum="yes"
                    IncludeMaximum="yes" />
</Upgrade>

<InstallExecuteSequence>
    <RemoveExistingProducts After="InstallInitialize"/>
</InstallExecuteSequence>
<!-- ... rest of package configuration ... -->

Bundle.wxs (bootstrapper project)

<Bundle Name="$(var.ProductName)"
    Version="$(var.ProductVersion)"
    Manufacturer="$(var.Manufacturer)"
    UpgradeCode="{01F40945-4195-4FBE-886C-2F1137F21D6B}">

<RelatedBundle Action="Upgrade"
               Id="{01F40945-4195-4FBE-886C-2F1137F21D6B}"/>
<!-- ... rest of bundle configuration ... -->

I'm testing with an initial version of x.y.0.0 trying to upgrade to a version with the same major and minor version but an incremented build version.

My Suspicion:

The issue might be related to the Bundle's UpgradeCode, which is a new addition compared to the InstallShield setup.

Has anyone successfully implemented minor upgrades with WiX v4 Bundles? What am I missing in my configuration?