All resources should be installed by one and only one Component, where
Component is defined by the Component/@Guid. The SetupRegistry_x64 and
SetupRegistry_x86 Components were sharing the env vars across the 32-bit
and 64-bit packages. That is a Component Rule violation.
The fix is simple. Since the 32-bit registration is always required, let
it handle the env var installation. The code is cleaner as well.
Set a new registry 'BuildType' when installing. Check for this reg key
when upgrading to a newer version. Show error message and exit
if the previous installation does not have the same 'BuildType'.
Install path is now %ProgramFiles%\dotnet
Registry root is now "HKLM\SOFTWARE\dotnet\Setup"
Env variables setup is now associated with a versioned component - the
registry keys. Environment resource cannot serve as a keypath hence it is
coupled with a registry key which is the key path for the component.
