wix installer 3.7 bootstrapper Registry search - wix

Question

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
xmlns:bal="http://schemas.microsoft.com/wix/BalExtension"
xmlns:netfx='http://schemas.microsoft.com/wix/NetFxExtension'>
<Bundle Name="IPDev" Version="0.6" Manufacturer="MYAPP Corporation" UpgradeCode="f380ae43-5df1-4cfe-9297-526e3e638e57">
<BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense" />
<Chain>
<!-- TODO: Define the list of chained packages. -->
<PackageGroupRef Id="Netfx45FullPackage"/>
</Chain>
</Bundle>
<Fragment>
<!--checking for matlab 2012a installation-->
<util:RegistrySearch Id="MatlabPath"
Variable="UniqueId"
Root="HKLM"
Key="SOFTWARE\MathWorks\MATLAB\4.17\"
Result="exists"
Win64="yes"
/>
<!--checking for matlab MCR 2012a 64 bit installation-->
<util:RegistrySearch Id="MatlabMCRPath"
Variable="UniqueId"
Root="HKLM"
Key="SOFTWARE\MathWorks\MATLAB Compiler Runtime\7.17\"
Result="exists"
Win64="yes"
/>
<PackageGroup Id="Netfx45FullPackage">
<ExePackage Id="Netfx45Xxx" Cache="no" Compressed="no" PerMachine="yes" Permanent="yes" Vital="no" InstallCommand="/q"
SourceFile="..\SetupProject\dotnetfx45_full_x86_x64.exe"
DetectCondition="(Netfx4FullVersion="4.5.50709") AND (NOT VersionNT64 OR (Netfx4x64FullVersion="4.5.50709"))"
InstallCondition="(VersionNT >= v6.0 OR VersionNT64 >= v6.0) AND (NOT (Netfx4FullVersion="4.5.50709" OR Netfx4x64FullVersion="4.5.50709"))"/>
<ExePackage Id="MatlabMCR2012a64" Cache="no" Compressed="no" PerMachine="yes" Permanent="yes" Vital="no" InstallCommand="/q"
SourceFile="..\SetupProject\MCR_R2012a_win64_installer.exe"
InstallCondition="(NOT MatlabPath) OR (NOT MatlabMCRPath)"/>
<MsiPackage Id="IPDev" Cache="no" Compressed="no" DisplayInternalUI="yes" Vital="yes" SourceFile="..\SetupProject\bin\Release\IPDevSetup.msi"/>
</PackageGroup>
</Fragment>
</Wix>
here's my code:
my problem is that .NET4.5 is installed only if it exists.
however MATLAB's MCR is installed whether it exists or not.
can you please tell me what's wrong with my condition:
InstallCondition="(NOT MatlabPath) AND (NOT MatlabMCRPath)"
fix after Rob's answer:
DetectCondition="MatlabMCRPathExists OR MatlabPathExists"
this condition should be false in order to install

Answer 1

Here is my final and working code:
this code check's for .NET 4.5 installation.
and for Matlab R2012a or Matlab MCR R2012a.
<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"
xmlns:bal="http://schemas.microsoft.com/wix/BalExtension"
xmlns:netfx='http://schemas.microsoft.com/wix/NetFxExtension'>
<Bundle Name="IPDev" Version="0.6" Manufacturer="Intel Corporation" UpgradeCode="f380ae43-5df1-4cfe-9297-526e3e638e57">
<BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense" />
<Chain>
<!-- TODO: Define the list of chained packages. -->
<PackageGroupRef Id="Netfx45FullPackage"/>
</Chain>
</Bundle>
<Fragment>
<!--checking for matlab 2012a installation-->
<util:RegistrySearch Id="MatlabPath"
Variable="MatlabPathExists"
Root="HKLM"
Key="SOFTWARE\MathWorks\MATLAB\4.17"
Result="exists"
Win64="yes" />
<!--checking for matlab MCR 2012a 64 bit installation-->
<util:RegistrySearch Id="MatlabMCRPath"
Variable="MatlabMCRPathExists"
Root="HKLM"
Key="SOFTWARE\MathWorks\MATLAB Compiler Runtime\7.17"
Result="exists"
Win64="yes" />
<PackageGroup Id="Netfx45FullPackage">
<ExePackage Id="Netfx45Xxx" Cache="no" Compressed="no" PerMachine="yes" Permanent="yes" Vital="no" InstallCommand="/q"
SourceFile="..\SetupProject\dotnetfx45_full_x86_x64.exe"
DetectCondition="(Netfx4FullVersion="4.5.50709") AND (NOT VersionNT64 OR (Netfx4x64FullVersion="4.5.50709"))"
InstallCondition="(VersionNT >= v6.0 OR VersionNT64 >= v6.0) AND (NOT (Netfx4FullVersion="4.5.50709" OR Netfx4x64FullVersion="4.5.50709"))"/>
<ExePackage Id="MatlabMCR2012a64" Cache="no" Compressed="no" PerMachine="yes" Permanent="yes" Vital="no" InstallCommand="/q"
SourceFile="..\SetupProject\MCR_R2012a_win64_installer.exe"
DetectCondition="MatlabMCRPathExists OR MatlabPathExists"/>
<MsiPackage Id="IPDev" Cache="no" Compressed="no" DisplayInternalUI="yes" Vital="yes" SourceFile="..\SetupProject\bin\Release\IPDevSetup.msi"/>
</PackageGroup>
</Fragment>
</Wix>

Answer 2

The InstallCondition attribute is used to determine whether a package should be installed on the machine. If true, the package is allowed to install. If false, the package is uninstalled. What you want is a DetectCondition attribute to determine whether the package is already present on the machine.
The fix is probably just to change the Matlab ExePackage/#InstallCondition to a ExePackage/#DetectCondition.

Answer 3

You can correct your RegistrySearch call like below:
<!--checking for matlab 2012a installation-->
<util:RegistrySearch Id="MatlabPath"
Variable="MatlabPathExists"
Root="HKLM"
Key="SOFTWARE\MathWorks\MATLAB\4.17\"
Result="exists"/>
<!--checking for matlab MCR 2012a 64 bit installation-->
<util:RegistrySearch Id="MatlabMCRPath"
Variable="MatlabMCRPathExists"
Root="HKLM"
Key="SOFTWARE\MathWworks\MATLAB Compiler Runtime\7.17\"
Result="exists"/>
<PackageGroup Id="Netfx45FullPackage">
This search sets the search result to the variable MatlabPathExists and MatlabMCRPathExists.
Then your condition check should be like following using those variables:
DetectCondition="(NOT MatlabPathExists) OR (NOT MatlabMCRPathExists)"