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From WiX Wiki at MindCapers

I am beginner in WIX, and a couple of days back I had a similar issue. The following are the changes i made after help from this group. Added the following line in <InstallUISequence> and <InstallExecuteSequence>

<LaunchConditions After='AppSearch' />

This will ensure that the LaunchConditions are executed only after searching. This is the code from my wxs file:

   <Condition Message="Software is not installed "> SUITEINSTALLDIR </Condition>
   
  <Property Id="SUITEINSTALLDIR"> 
      <RegistrySearch Id='BOBJRegistry' 
                      Type='raw' 
                      Root='HKLM' 
                      Key='Software\Company\Suite 12.0\Shared' 
                      Name='SuiteInstallDir' /> 
   </Property>
   
   <InstallUISequence>
      <LaunchConditions After='AppSearch' />
   </InstallUISequence>
   
   <InstallExecuteSequence>
      <LaunchConditions After='AppSearch' />
   </InstallExecuteSequence>