Hangfire Pro 2.1 needs Hangfire.Core 1.5

I Upgraded Hangfire Pro from 1.48 to 2.1.0, why do i need to downgrade the Hangfire.Core from 1.6.11 to 1.5? Is it save to downgrade?

Hi @SvenLauterbach, ensure you are using the latest NuGet versions. For command-line client run the NuGet.exe update -self command, for Visual Studio – ensure you are using at least VS 2015, and update NuGet Package Manager by using the Tools / Extensions and Updates dialog.

As you can see in the private NuGet feed, dependencies are the same in both versions, and something wrong with the tooling: