Hi Abeer,
Greetings from Syncfusion. You can get required assemblies for SfChart and Sparkline control in following location.
Also, you can find the samples for SfChart and Sparkline under the following installed location.
C:\Users\Public\Documents\Syncfusion\Universal Windows\<Version>\SampleBrowser\SfChart
C:\Users\Public\Documents\Syncfusion\Universal Windows\<Version>\SampleBrowser\SfSparkline
Hope this helps.
Thanks,
Muneesh Kumar G.