This release includes all samples for the ArcObjects SDK 10.8.
In addition to the source code some samples are using specific datasets which are included in ArcObjectsSampleData-10.8.zip. Samples that are making use of the sample data expect the sample data in a specific location on your development system. The sample data should be unzipped in the %USERPROFILE%\documents\ArcGIS folder resulting in a %USERPROFILE%\documents\ArcGIS\data folder that in turn contains sample data folders like AirportsAndGolf, BloomfieldTownship, California, and more. If you use a different folder for the sample data you need to update the sample code accordingly.