ProductName change for upgrade

MajorUpgrade

Seems that the "old" product isn't removed during upgrade.
What does a verbose log tell you?

From the Altiris Knowledgebase: https://kb.altiris.com/article.asp?article=3655&p=1

Problem/Symptoms

The previous version .MSI is still listed in the Add/Remove Programs Control Panel along with the updated .MSI.
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Environment

Windows Installer
Wise for Windows Installer
Wise Package Studio

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Cause

The updated .MSI does not contain Upgrade information, but has a product code different from the previous version.
-OR-
The updated .MSI contains Upgrade information, but the minimum and maximum versions of the upgrade range do not include all previous versions.
-OR-
An installed patch was generated from two .MSI files that have different product codes.

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Resolution

Ensure that the previous version .MSI and the updated .MSI have different product codes and that the updated .MSI has Upgrade information.
Verify that the minimum and maximum version entries in the Upgrade information encompass the previous version .MSI.

Patches should not be generated from .MSI files that do not have identical product codes. If the product codes are different, Windows Installer Upgrade functionality should be used.

If it is just the ARP entry which is troubling you, then you can use Remove Registry option to remove the Add/Remove entry.

This information is stored in :
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
Under it you have to search for your product and then remove these registries from your package.

Hope this helps. 

>then remove these registries from your package.

Except, of course, the package doesn't contain them. They're written to the registry by the RegisterProduct action.

It is counter-productive to kludge things like this, as it is to advise people to do it. It's like filling your car's engine with sand to disguise the sound of the big end clattering. Work out what the actual problem is and fix it - don't try and hide it because you can't be bothered to do basic trouble-shooting.