I added all the packages from the SyncFusion NuGet source - yet a bunch of errors...
Cannot find the static member 'LeftHeaderItemTemplateProperty' on the type 'ChromelessWindow'. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the static member 'FilterIconVisibilityProperty' on the type 'TreeGridHeaderCell'. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Only public or internal classes can be used within markup. 'OrthogonalControlPointToBooleanConverter' type is not public or internal. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The tag 'BoolToVisibilityConverter' does not exist in XML namespace 'clr-namespace:Syncfusion.Windows.Controls.Printing;assembly=Syncfusion.SfShared.Wpf'. Line 27 Position 6. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'KnobStroke' on the type 'Syncfusion.UI.Xaml.Gauges.CircularPointer'. Line 41 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'FontWeight' on the type 'Syncfusion.UI.Xaml.Kanban.PlaceholderStyle'. Line 228 Position 11. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'TreeMapResourceDictionary' on the type 'Syncfusion.UI.Xaml.TreeMap.SfTreeMap'. Line 23 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'MapResourceDictionary' on the type 'Syncfusion.UI.Xaml.Maps.SfMap'. Line 49 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'SmithChartResourceDictionary' on the type 'Syncfusion.UI.Xaml.SmithChart.SfSmithChart'. Line 15 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'SunburstResourceDictionary' on the type 'Syncfusion.UI.Xaml.SunburstChart.SfSunburstChart'. Line 45 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The tag 'ResourceWrapper' does not exist in XML namespace 'clr-namespace:Syncfusion.Windows.PropertyGrid.Resources;assembly=Syncfusion.PropertyGrid.WPF'. Line 25 Position 6. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The tag 'BrushToTextConverter' does not exist in XML namespace 'clr-namespace:Syncfusion.Windows.Tools;assembly=Syncfusion.Shared.Wpf'. Line 26 Position 6. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The tag 'BrushToTextConverter' does not exist in XML namespace 'clr-namespace:Syncfusion.Windows.Tools;assembly=Syncfusion.Shared.Wpf'. Line 26 Position 6. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'HeaderTemplate' on the type 'Syncfusion.Windows.Tools.Controls.ColorPickerPalette'. Line 220 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'MultiSelectMode' on the type 'Syncfusion.Windows.Controls.Input.SfTextBoxExt'. Line 273 Position 22. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'FocusedBorderBrush' on the type 'Syncfusion.UI.Xaml.TextInputLayout.SfTextInputLayout'. Line 34 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the static member 'InactiveTrackStyleProperty' on the type 'SfRangeSlider'. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The tag 'DockAbilityToBoolConverter' does not exist in XML namespace 'clr-namespace:Syncfusion.Windows.Tools.Controls;assembly=Syncfusion.Tools.WPF'. Line 37 Position 6. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'NewTabButtonTemplate' on the type 'Syncfusion.Windows.Tools.Controls.TabControlExt'. Line 1351 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Style Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property. Line 67 Position 46. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Only public or internal classes can be used within markup. 'QATListBox' type is not public or internal. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Template Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the property. Line 208 Position 34. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Template Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the property. Line 180 Position 44. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Style Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property. Line 91 Position 23. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Template Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the property. Line 219 Position 34. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Style Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property. Line 40 Position 22. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot resolve the Style Property 'LayoutMode'. Verify that the owning type is the Style's TargetType, or use Class.Property syntax to specify the Property. Line 238 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'MediumIcon' on the type 'Syncfusion.Windows.Tools.Controls.DropDownButton'. Line 334 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Cannot find the Style Property 'CenterBackButtonForeground' on the type 'Syncfusion.Windows.Controls.Navigation.SfRadialMenu'. Line 430 Position 17. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The type reference cannot find a public type named 'BulletsAndNumberingDialog'. Line 506 Position 66. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
The type reference cannot find a public type named 'StylesDialog'. Line 13 Position 53. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore
Only public or internal classes can be used within markup. 'ToolbarMenuItem' type is not public or internal. Syncfusion.Themes.MaterialLightBlue.WPF_NETCore