I have a burn installer, whereby the original installer can effectively
select which items to install via checkBoxes, which relate to individual
msi's.
These are working via InstallConditions, checking the fact that the
checkbox has been checked, and that they are not installed. So far so good
and that's it for options on install.

I'm trying to run the updates without user invention, so are running them
/passive .
I'm assuming (this may be where my logic falls down) that all I need to
check for is whether they have been installed or not, in order to only
update those parts that have been installed, so
InstallCondition="Installed"

Alas on running an update, everything evaluates to false, and the exe's
installed by the original install disapear, as defined in the wix manual -
"If the condition evaluates to false and the bundle is being installed,
repaired, or modified, the package will be uninstalled."

    <WixVariable Id="chkProductA" Value="![CDATA[chkProductA]]" />
    <WixVariable Id="chkProductB" Value="![CDATA[chkProductB]]" />
    <WixVariable Id="chkProductC" Value="![CDATA[chkProductC]]" />

    <Chain>
      <MsiPackage SourceFile="..\ProductA\bin\Release\ProductA.msi"
                  InstallCondition="(chkProductA AND NOT Installed) OR
INSTALLED" />
      <MsiPackage SourceFile="..\ProductB\bin\Release\ProductB.msi"
                  InstallCondition="(chkProductB AND NOT Installed) OR
INSTALLED" />
      <MsiPackage SourceFile="..\ProductC\bin\Release\ProductC.msi"
                  InstallCondition="(chkProductC AND NOT Installed) OR
INSTALLED" />
    </Chain>

The log states:
Detected package: SetupProductA.msi, state: Absent, cached: None
Detected package: SetupProductB.msi, state: Absent, cached: None
Detected package: SetupProductC.msi, state: Absent, cached: None
Detect complete, result: 0x0
Plan 3 packages, action: Install
Condition '(chkProductA AND NOT Installed) OR INSTALLED' evaluates to false.
Condition '(chkProductB AND NOT Installed) OR INSTALLED' evaluates to false.
Condition '(chkProductC AND NOT Installed) OR INSTALLED' evaluates to false.

What am I missing with my InstallConditions?

Thanks
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