(Registry) 
In registry key HKLM; Root: Subkey: "SOFTWARE \ mysoft"; ValueType: dword; ValueName: "version"; ValueData: 1; Flags: deletevalue 

After good file under Windows 10 systems, packaging, installation operation N times is unable to write to the registry

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Access to? Error prompt?

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reference 1st floor aabbabababaa response:

permissions to? Error prompt?

No error message, Permissions: users - the modify Settings