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How to implement nested msi without 1618 error?

cn flag

I have kept the python exe installation(internally msi exists) as a custom action in vbscript and calling that just before InstallFinalize(definitely will be after CostFinalize) in Execute Sequence and in deferred system context.

As per this link, I should keep after CostFinalize

But still I am getting 1618 error code during installation.: Another Installation is already in progress

Please suggest how to fix this.

I can't call this later of installation as I am passing the subfolder of installdir as python install directory,which I can get access only during installation of msi.

mangohost

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