I'm trying to do the tutorial "Checking for Oldies" from https://www.firegiant.com/wix/tutorial/upgrades-and-modularization/checking-for-oldies/ .
<?xml version='1.0' encoding='Windows-1252'?>
<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi'>
<Product Name='Foobar 1.0.1' Manufacturer='Acme Ltd.'
Id='027F68D8-1963-4C76-8274-7091232BB4F4'
UpgradeCode='6768C9D3-52DF-4E7E-A8C3-F9CB9F29EA91'
Language='1033' Codepage='1252' Version='1.0.1' >
<Package Id='*' Keywords='Installer' Description="Acme's Foobar 1.0.1 Installer"
Comments='Foobar is a registered trademark of Acme Ltd.' Manufacturer='Acme Ltd.'
InstallerVersion='100' Languages='1033' Compressed='yes' SummaryCodepage='1252' />
<UI Id="MyWixUI_Mondo">
<UIRef Id="WixUI_Mondo" />
<UIRef Id="WixUI_ErrorProgressText" />
<DialogRef Id="UserRegistrationDlg" />
<Publish Dialog="LicenseAgreementDlg" Control="Next" Event="NewDialog" Value="UserRegistrationDlg" Order="3">LicenseAccepted = "1"</Publish>
<Publish Dialog="SetupTypeDlg" Control="Back" Event="NewDialog" Value="UserRegistrationDlg">1</Publish>
</UI>
<Upgrade Id='10A11EA3-8A34-46A1-87D9-679C944E305C'>
<UpgradeVersion OnlyDetect='yes' Property='SELFFOUND'
Minimum='1.0.1' IncludeMinimum='yes'
Maximum='1.0.1' IncludeMaximum='yes' />
<UpgradeVersion OnlyDetect='yes' Property='NEWERFOUND'
Minimum='1.0.1' IncludeMinimum='no' />
</Upgrade>
<Property Id="INSTALLDIR">
<RegistrySearch Id='AcmeFoobarRegistry' Type='raw' Root='HKLM' Key='Software\Acme\Foobar 1.0' Name='InstallDir' />
</Property>
<Property Id="FILEB1EXISTS">
<DirectorySearch Id="CheckFileDir" Path="[INSTALLDIR]" Depth="0">
<FileSearch Id="CheckFile" Name="B1.txt" />
</DirectorySearch>
</Property>
<Property Id="WIXUI_INSTALLDIR" Value="INSTALLFOLDER" />
<Media Id='1' Cabinet='Sample.cab' EmbedCab='yes' DiskPrompt="CD-ROM #1" />
<Property Id='DiskPrompt' Value="Acme's Foobar 1.0 Installation [1]" />
<Directory Id='TARGETDIR' Name='SourceDir'>
<Directory Id='ProgramFilesFolder' Name='PFiles'>
<Directory Id='Acme' Name='Acme'>
<Directory Id='INSTALLFOLDER' Name='Foobar 1.0'>
<Component Id='MainExecutable' Guid='9805D06F-DF58-4FF5-A9E9-74B11C794D7A'>
<File Id='FoobarEXE' Name='FoobarAppl10.exe' DiskId='1' Source='FoobarAppl10.exe' KeyPath='yes'>
<Shortcut Id="startmenuFoobar10" Directory="ProgramMenuDir" Name="Foobar 1.0" WorkingDirectory='INSTALLDIR' Icon="Foobar10.exe" IconIndex="0" Advertise="yes" />
<Shortcut Id="desktopFoobar10" Directory="DesktopFolder" Name="Foobar 1.0" WorkingDirectory='INSTALLDIR' Icon="Foobar10.exe" IconIndex="0" Advertise="yes" />
</File>
<RemoveFile Id='LogFile' On='uninstall' Name='Foobar10User.log' />
</Component>
<Component Id='HelperLibrary' Guid='5AE6F8C7-AEC7-43A0-B4D8-1178D7FC7C3A'>
<File Id='HelperDLL' Name='Helper.dll' DiskId='1' Source='Helper.dll' KeyPath='yes' />
</Component>
<Component Id='Manual' Guid='0AC1B698-822E-4B56-8D78-42DDF84D8667'>
<File Id='Manual' Name='Manual.pdf' DiskId='1' Source='Manual.pdf' KeyPath='yes'>
<Shortcut Id='startmenuManual' Directory='ProgramMenuDir' Name='Instruction Manual' Advertise='yes' />
</File>
</Component>
</Directory>
</Directory>
</Directory>
<Directory Id="ProgramMenuFolder" Name="Programs">
<Directory Id="ProgramMenuDir" Name="Foobar 1.0">
<Component Id="ProgramMenuDir" Guid="B36BF023-6797-476B-BAAD-4AFD5CCE7A9A">
<RemoveFolder Id='ProgramMenuDir' On='uninstall' />
<RegistryValue Root='HKCU' Key='Software\[Manufacturer]\[ProductName]' Type='string' Value='' KeyPath='yes' />
</Component>
</Directory>
</Directory>
<Directory Id="DesktopFolder" Name="Desktop" />
</Directory>
<Feature Id='Complete' Level='1'>
<Feature Id='MainProgram' Level='1'>
<ComponentRef Id='MainExecutable' />
<ComponentRef Id='HelperLibrary' />
<ComponentRef Id='ProgramMenuDir' />
</Feature>
<Feature Id='Documentation' Level='1'>
<ComponentRef Id='Manual' />
<Condition Level="0">NOT FILEB1EXISTS</Condition>
</Feature>
</Feature>
<Icon Id="Foobar10.exe" SourceFile="FoobarAppl10.exe" />
<Property Id='NOTEPAD'>Notepad.exe</Property>
<!--<CustomAction Id='LaunchFile' Property='NOTEPAD' ExeCommand='[SourceDir]Readme.txt' Return='asyncNoWait' />
<InstallExecuteSequence>
<Custom Action='LaunchFile' After='InstallFinalize'>NOT Installed</Custom>
<Custom Action='AlreadyUpdated' After='FindRelatedProducts'>SELFFOUND</Custom>
<Custom Action='NoDowngrade' After='FindRelatedProducts'>NEWERFOUND</Custom>
</InstallExecuteSequence>-->
<CustomAction Id='LaunchFile' Property='NOTEPAD' ExeCommand='[SourceDir]Readme.txt' Return='asyncNoWait' />
<CustomAction Id='AlreadyUpdated' Error='Foobar 1.0 has already been updated to 1.0.1 or newer.' />
<CustomAction Id='NoDowngrade' Error='A later version of [ProductName] is already installed.' />
<InstallExecuteSequence>
<Custom Action='AlreadyUpdated' After='FindRelatedProducts'>SELFFOUND</Custom>
<Custom Action='NoDowngrade' After='FindRelatedProducts'>NEWERFOUND</Custom>
</InstallExecuteSequence>
</Product>
</Wix>
My problem is SELFFOUND and NEWERFOUND never set to true, thus I never reach the condition to see the message AlreadyUpdated or NoDowngrade
Result of "FindRelatedProduct" in verbose mode : MSI (c) (C0:F8) [08:43:46:624]: Doing action: FindRelatedProducts Action 08:43:46: FindRelatedProducts. Searching for related applications Action start 08:43:46: FindRelatedProducts. Action ended 08:43:46: FindRelatedProducts. Return value 1.
MSI (s) (04:60) [08:43:55:263]: Doing action: FindRelatedProducts Action 08:43:55: FindRelatedProducts. Searching for related applications Action start 08:43:55: FindRelatedProducts. MSI (s) (04:60) [08:43:55:263]: Skipping FindRelatedProducts action: already done on client side Action ended 08:43:55: FindRelatedProducts. Return value 0. MSI (s) (04:60) [08:43:55:263]: Skipping action: AlreadyUpdated (condition is false) MSI (s) (04:60) [08:43:55:263]: Skipping action: NoDowngrade (condition is false)
Assuming your UpgradeCode guids and versions are correct, you may be cross context; a per user install cannot upgrade (or detect) a per machine install, and vice versa. If you do the install with a verbose log then it may tell you that FindRelatedProducts didn't find one in your install context.
Note that your Upgrade element Id is not set to your UpgradeCode GUID.
From Checking for Oldies:
The Id attribute of the Upgrade tag refers back to the UpgradeCode GUID of the original installation package
来源：https://stackoverflow.com/questions/36150902/wix-upgradeversion