Upgrading application does not always remove prior installed application

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Upgrading application does not always remove prior installed application

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Hi everyone,

First of all, I've tried to find explanations on several forums but I didn't found a topic that might explain the behavior observed.

The observed behavior: When upgrading product, prior installation is not always removed correctly

What changed between previous and new installer wix setup project:
The previous product installer was installing under Directory <Directory Id="ProgramFiles64Folder">
The new installer has been updated is installing under <Directory Id="ProgramFilesFolder"> 
Checking for .NEt framework 4.5 or newer installed*
Add InstallDirDlg and set <Property Id="WIXUI_INSTALLDIR" Value="INSTALLFOLDER" />

1- When I upgrade product on my computer (Windows 10 - 64 bits OS) everything works fine:
Previous product installed under "C:\Program Files\" is uninstalled correctly
RemoveExistingProducts: Application: {F6E83B3C-CA4D-4FE2-BB54-4D5156D9EB98}, Command line: UPGRADINGPRODUCTCODE={DB2D1294-EA5F-4BEF-BFBC-A236E0DCDEB3} CLIENTPROCESSID=21584 CLIENTUILEVEL=0 REMOVE=ALL
New product is installed under "C:\Program Files (x86)\"

2- But on other hand, a user has encountered a problem: previous product is not uninstalled (Windows 7 - 64 bits OS)
What I can see when upgrading with verbose logs is that previous version is found:

RemoveExistingProducts: Application: {F6E83B3C-CA4D-4FE2-BB54-4D5156D9EB98}, Command line: UPGRADINGPRODUCTCODE={E71A5696-B038-4EEE-9B4A-DE0A3D84045E}  CLIENTUILEVEL=0 REMOVE=ALL

When CostFinalize sequence is started to remove existing product, all directory structure location is changed to 'C:\Program Files (x86)\' where product is not yet installed:

MSI (s) (6C:60) [12:17:56:505]: PROPERTY CHANGE: Modifying ProgramFiles64Folder property. Its current value is 'C:\Program Files\'. Its new value: 'C:\Program Files (x86)\'.
MSI (s) (6C:60) [12:17:56:505]: PROPERTY CHANGE: Adding JaliosDIR property. Its value is 'C:\Program Files (x86)\Jalios\'.
MSI (s) (6C:60) [12:17:56:505]: WIN64DUALFOLDERS: 'C:\Program Files (x86)\' will substitute 17 characters in 'C:\Program Files\Jalios\Jalios JDrive\' folder path. (mask argument = 0, the folder pair's iSwapAttrib member = 0).
MSI (s) (6C:60) [12:17:56:505]: PROPERTY CHANGE: Modifying INSTALLFOLDER property. Its current value is 'C:\Program Files\Jalios\Jalios JDrive'. Its new value: 'C:\Program Files (x86)\Jalios\Jalios JDrive\'.


I have the upgrade log files (the one working and the other failing)
I can give you more details if needed on the wix file.wxs used to generate msi

Has anyone faced a such behavior ?
Is the only solution to uninstall prior version and install the new one ?

In advance, thanks to all !