I cannot run your comparison example program asserts at bold line below, message is:
Unlicensed version of GroupDocs.Comparison for .Net allows 15 comparison per hour
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//ExStart:ComparePdfFromPathToFileWithSettings
/// <summary>
/// Compare two Pdf from file path with saving results into a file with document settings
/// </summary>
public static void ComparePdfFromPathToFileWithSettings()
{
// Get instance of GroupDocs.Comparison.Comparison and call method Compare.
GroupDocs.Comparison.Comparison comparison = Common.getComparison();
Stream result = comparison.Compare(Path.Combine(Common.sourcePath, Common.sourceFile), Path.Combine(Common.targetPath, Common.targetFile), Path.Combine(Common.resultPath, Common.resultFile), ComparisonType.Pdf, new PdfComparisonSettings());
}
//ExEnd:ComparePdfFromPathToFileWithSettings