It looks like you have some bad publish. I am getting also an error message on Windows and windows phone 8.1 project. why do I get an IOS assembly reference on windows projects. see the screen shot as well. I did the update using
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Error Loading assembly "C:\Git\nugetpackages\Syncfusion.Xamarin.SfDataGrid.14.4.0.15\lib\Xamarin.iOS10\Syncfusion.SfDataGrid.XForms.iOS.dll" failed. System.IO.FileNotFoundException: Could not load file or assembly 'Xamarin.Forms.Platform.iOS, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'Xamarin.Forms.Platform.iOS, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'
at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
at System.Reflection.RuntimeAssembly.GetCustomAttributes(Type attributeType, Boolean inherit)
at System.Attribute.GetCustomAttributes(Assembly element, Type attributeType, Boolean inherit)
at System.Attribute.GetCustomAttribute(Assembly element, Type attributeType, Boolean inherit)
at System.Reflection.CustomAttributeExtensions.GetCustomAttribute[T](Assembly element)
at Microsoft.Build.Tasks.ProcessResourceFiles.ReadAssemblyResources(String name, String outFileOrDir)
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].