This package has been deprecated as it is legacy and no longer maintained.

[vladik-vitre]

This is the first time I used Nuget Package Manager GUI.
I did it in order check what is going to be the result about a deprecated package we use.
This is what Visual Studio shows about the package

This is what Nuget Package Manager GUI shows

I think you should notify the user that his package is deprecated as Visual Studio does.

[aliasadidev]

It sounds good.
I'll add it in the next release.