Show error message if Goldberg could not be downloaded/extracted, prompting the user to do so manually.

Try to skip getting DLC from SteamDB on error.

GoldbergGUI.Core/Services/GoldbergService.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using System.Net.Http;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+using System.Windows;
 using GoldbergGUI.Core.Models;
 using GoldbergGUI.Core.Utils;
 using MvvmCross.Logging;
@@ -85,7 +86,10 @@ namespace GoldbergGUI.Core.Services
             _log = log;
 
             var download = await Download().ConfigureAwait(false);
-            if (download) await Extract(_goldbergZipPath).ConfigureAwait(false);
+            if (download)
+            {
+                await Extract(_goldbergZipPath).ConfigureAwait(false);
+            }
             return await GetGlobalSettings().ConfigureAwait(false);
         }
 
@@ -378,6 +382,8 @@ namespace GoldbergGUI.Core.Services
         }
 
         private async Task StartDownload(string downloadUrl)
+        {
+            try
             {
                 var client = new HttpClient();
                 _log.Debug(downloadUrl);
@@ -390,6 +396,13 @@ namespace GoldbergGUI.Core.Services
                     _log.Info("Download finished!");
                 }
             }
+            catch (Exception e)
+            {
+                ShowErrorMessage();
+                _log.Error(e.ToString);
+                Environment.Exit(1);
+            }
+        }
 
         // Empty subfolder ./goldberg/
         // Extract all from archive to subfolder ./goldberg/
@@ -397,13 +410,34 @@ namespace GoldbergGUI.Core.Services
         {
             _log.Debug("Start extraction...");
             await Task.Run(() =>
+            {
+                try
                 {
                     Directory.Delete(_goldbergPath, true);
                     ZipFile.ExtractToDirectory(archivePath, _goldbergPath);
+                }
+                catch (Exception e)
+                {
+                    ShowErrorMessage();
+                    _log.Error(e.ToString);
+                    Environment.Exit(1);
+                    // throw;
+                }
             }).ConfigureAwait(false);
             _log.Debug("Extraction done!");
         }
 
+        private void ShowErrorMessage()
+        {
+            if (Directory.Exists(_goldbergPath))
+            {
+                Directory.Delete(_goldbergPath, true);
+            }
+            Directory.CreateDirectory(_goldbergPath);
+            MessageBox.Show("Could not setup Goldberg Emulator!\n" +
+                            "Please download it manually and extract its content into the \"goldberg\" subfolder!");
+        }
+
         // https://gitlab.com/Mr_Goldberg/goldberg_emulator/-/blob/master/generate_interfaces_file.cpp
         // (maybe) check DLL date first
         public async Task GenerateInterfacesFile(string filePath)

GoldbergGUI.Core/Services/SteamService.cs

@@ -218,6 +218,8 @@ namespace GoldbergGUI.Core.Services
 
                     // ReSharper disable once InvertIf
                     if (useSteamDb)
+                    {
+                        try
                         {
                             var steamDbUri = new Uri($"https://steamdb.info/app/{steamApp.AppId}/dlc/");
 
@@ -268,6 +270,12 @@ namespace GoldbergGUI.Core.Services
                                 _log.Error("Could not get DLC from SteamDB!");
                             }
                         }
+                        catch (Exception e)
+                        {
+                            _log.Error("Could not get DLC from SteamDB!");
+                            _log.Error(e.ToString);
+                        }
+                    }
                 }
                 else
                 {