The owner has unlisted this package. This could mean that the package is deprecated or shouldn't be used anymore.
Install-Package Butterfly.Core -Version 1.0.1
dotnet add package Butterfly.Core --version 1.0.1
<PackageReference Include="Butterfly.Core" Version="1.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Butterfly.Core --version 1.0.1
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Changed to target .NET Standard 2.0
This package is not used by any popular GitHub repositories.