Package sources are stored in NuGet.config in the user profile or system in ProgramData:
%AppData%\NuGet\NuGet.config %ProgramData%\NuGet\NuGetDefaults.config
You can add package sources via NuGet using a command line similar to:
nuget sources add -name FeedName -Source http://YourFeed.com
The above command will work if you run it under the user profile.
NuGet 2.7 has implemented a system package source configuration in ProgramData. This way you can add your package sources to NuGet.config in ProgramData with your installer.
Matt ward
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