Does any know why the RemoveExistingProducts action would fail when an
upgrade is run silently?

If I run in full UI mode, everything works as expected.  If I run the
upgrade with /qn, the RemoveExistingProducts does not work and I end up with
both products installed on the system.

RemoveExistingProducts is scheduled right after InstallInitialize.

Verbose log says:


MSI (s) (B8:28) [03:53:57:096]: Doing action: RemoveExistingProducts
Action ended 3:53:57: InstallInitialize. Return value 1.
Action start 3:53:57: RemoveExistingProducts.
MSI (s) (B8:48) [03:53:57:128]: Resetting cached policy values
MSI (s) (B8:48) [03:53:57:128]: Machine policy value 'Debug' is 0
MSI (s) (B8:48) [03:53:57:128]: ******* RunEngine:
           ******* Product: 1
           ******* Action:
           ******* CommandLine: **********
MSI (s) (B8:28) [03:53:57:128]: Ignoring failure to remove product
during upgrade - product already uninstalled.
MSI (s) (B8:28) [03:53:57:128]: Doing action: ca_LogUserInfo
Action ended 3:53:57: RemoveExistingProducts. Return value 1.
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