Hello Sam,

Can you please elaborate on the package that is missing for you?

The Telerik packages are distributed via a private NuGet feed - https://nuget.telerik.com/v3/index.json - and looking at your profile I see you should have access to the latest version and it's packages.

KendoUIProfessional is available as a NuGet package:

as is the Telerik UI for ASP.NET Core:

That said, searching for the exact name - kendo.for.aspnet.core I see there was a package on NuGet, distributed by a third-party that is now indeed not available. If you are after the open source KendoUICore  than it is available on NuGet here.

I hope you will find the above information helpful. If you have further questions feel free to get back to me.

Regards,
Aleksandar
Progress Telerik