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No permission to access registry in Custom Action

I try to put a license key into the registry during installation in Install Shield Express. This is a legacy application, that I ported from Install Shield 6.3, so I tried to keep the path HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\.
I put a dll that computes the license key into [INSTALLDIR] and call a function in "Custom Actions During Installation/After Register Product". However RegCreateKeyEx fails in this function with "No Permissions".

What am I doing wrong?
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Re: No permission to access registry in Custom Action

Make sure that you set the In-Script Execution setting to "Deferred Execution in System Context" so that your custom action will execute with elevated privileges .
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Works perfect

Thank You!
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