Starting with version 17.1.0.32 (2019 Volume 1), Syncfusion will no longer publish NuGet packages at NuGet.syncfusion.com. From version 16.2.0.46 (2018 Volume 2 Service Pack 1) on, all our components are available as NuGet packages at NuGet.org. Refer this KB article for more information.
ASP.NET Core 16.4.0.52

Syncfusion Essential Studio ASP.NET Core NuGet packages

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https://nuget.syncfusion.com/nuget_aspnetcore/nuget/getsyncfusionpackages/aspnetcore
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ASP.NET Core NuGet Packages

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Syncfusion ASP.NET Core NuGet Packages
File Size: 89.70 MB | February 06, 2019
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