Detect if MS Store app is installed

FindPackageForUser.cs

        // Companion to: https://blog.mjfnet.com/2019/11/15/How-to-detect-if-a-Microsoft-Store-app-is-Installed/
        public static bool IsAppAlreadyInstalled(string FullPackageFamilyName)
        {
            var oPkgManager = new PackageManager();
            bool result = false;
            try
            {
                //If 1st parameter is string.Empty, the packages are retrieved for the current user.
               Package oPkg = oPkgManager.FindPackageForUser(string.Empty, FullPackageFamilyName);
                result = oPkg != null;
            }
            catch (ArgumentException syse)
            {
                Debug.WriteLine("Parameter Exception: Check Package full name argument for correct pattern. X.a_N.X.X.0x64__N");
                return result;
            }
            catch (UnauthorizedAccessException syse)
            {
                if (!string.IsNullOrEmpty(syse.Message))
                {
                    if (syse.Message.IndexOf("Access is denied", StringComparison.CurrentCulture) >= 0)
                    {
                        Debug.WriteLine("Access denied");
                        return result;
                    }
                }
            }
            catch (Exception ex)
            {
                if (!string.IsNullOrEmpty(ex.Message))
                    Debug.WriteLine(@"Exception: {0}", ex.Message);
                return result;
            }
            return result;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // Sample code: This should return 'access denied' since this will not exist on your machine
            var res = IsAppAlreadyInstalled("57012MikeFrancis.TrialTest123_1.66.5.0_x64__08pddan6qgabc");
        }