WiX Installer wrong about newer version already installed

Question

I have used WiX Install tools in Visual Studio to create create an installer for my C# Windows Forms application.

The Installer works when invoked independently (command

Answer 1

From Log: What product does this product code from the log file belong to?

Property(S): WIX_DOWNGRADE_DETECTED = {8BC4D6BF-C0CF-48EB-A229-FC692208DFF0}

Product Code & Product Name: Maybe try to run this script to figure out what product that really is: 1) copy & paste the script below into notepad, 2) save as ANSI file: "Product Code Lookup.vbs" on desktop, 3) double click script file to run:

On Error Resume Next ' we ignore all errors
Set installer = CreateObject("WindowsInstaller.Installer")
search = Trim(InputBox("Please paste or type in the product code you want to look up details for:", _
              "Find Product Details (test GUID provided):", "{8BC4D6BF-C0CF-48EB-A229-FC692208DFF0}"))
If search = vbCancel Or Trim(search) = "" Then
   WScript.Quit(0)
End If

For Each product In installer.ProductsEx("", "", 7)
   If (product.ProductCode = search) Then
      MsgBox "Product Code: " & product.ProductCode & vbNewLine & _
             "Product Name: " & product.InstallProperty("ProductName") & vbNewLine & _
             "Product Version: " & product.InstallProperty("VersionString"), vbOKOnly, "Match Found:"
      Exit For
   End If
Next

MsgBox "Completed product scan.", vbOKOnly, "Scan Complete"

Full List: If you want a text file with all products listed, please check the VBScript here (towards bottom).

AllowSameVersionUpgrades: Just answered another major upgrade question. Maybe skim it too: WIX does not uninstall older version. Remember that only the first 3 digits of the ProductVersion affect major upgrades. I am also not too keen on the "AllowSameVersionUpgrades" approach, I prefer the plain and simple major upgrade variant - like this (just my 2 cents, business requirements are always hard):

Upgrade Table: It would help to see the actual upgrade table. Is there anything funky in there? Multiple entries? Maybe you have re-used the same upgrade code for separate products? Upgrade code should remain the same for a product line or family of products that share upgrade handing. It should not be the same for different products that you want to upgrade separately. Generally speaking.

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Links:

• Determine msiexec exit code when msi file already installed