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.
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Syncfusion Essential Studio Windows Phone NuGet packages

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https://nuget.syncfusion.com/nuget_windowsphone/nuget/getsyncfusionpackages/windowsphone
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Windows Phone NuGet Packages

Version
Syncfusion Windows Phone 8 NuGet Package
File Size: 6.90 MB | November 18, 2016
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Syncfusion Windows Phone 8.1 NuGet Package
File Size: 19.20 MB | November 18, 2016
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