Program.cs

public class Program
    {
        public static void Main(string[] args)
        {
            var filePath = $@"Path to package.zip";

            ISource<PackageEntry> source = new Sitecore.Install.Zip.PackageReader(filePath);

            var packageSinkHelper = new PackageSinkManager();

            packageSinkHelper.Initialize(Installer.CreatePreviewContext());
            
            new EntrySorter(source).Populate(packageSinkHelper);

            Console.ReadKey();
        }
    }