diff --git a/Elwig/App.xaml.cs b/Elwig/App.xaml.cs
index dc9b104..b168787 100644
--- a/Elwig/App.xaml.cs
+++ b/Elwig/App.xaml.cs
@@ -339,20 +339,21 @@ namespace Elwig {
 
         public static async Task CheckForUpdates(bool showAlert = false) {
             if (Config.UpdateUrl == null) return;
-            var latest = await Utils.GetLatestInstallerUrl(Config.UpdateUrl);
-            if (latest != null && new Version(latest.Value.Version) > Version) {
-                await MainDispatcher.BeginInvoke(() => {
-                    var d = new UpdateDialog(latest.Value.Version, latest.Value.Url, latest.Value.Size);
-                    if (d.ShowDialog() == true) {
-                        ShutdownNow();
-                    }
-                });
-            } else if (showAlert) {
-                if (latest == null) {
-                    InteractionService.ShowError("Nach Updates suchen", "Informationen konnten nicht abgerufen werden!");
-                } else {
-                    InteractionService.ShowInformation("Nach Updates suchen", $"Elwig ist auf dem aktuellsten Stand! (Version: {latest.Value.Version})");
+            try {
+                var latest = await Utils.GetLatestInstallerUrl(Config.UpdateUrl);
+                if (new Version(latest.Version) > Version) {
+                    await MainDispatcher.BeginInvoke(() => {
+                        var d = new UpdateDialog(latest.Version, latest.Url, latest.Size);
+                        if (d.ShowDialog() == true) {
+                            ShutdownNow();
+                        }
+                    });
+                } else if (showAlert) {
+                    InteractionService.ShowInformation("Nach Updates suchen", $"Elwig ist auf dem aktuellsten Stand! (Version: {latest.Version})");
                 }
+            } catch (Exception exc) {
+                if (showAlert)
+                    InteractionService.ShowException("Nach Updates suchen", $"Informationen konnten nicht abgerufen werden!", exc);
             }
         }
 
diff --git a/Elwig/Helpers/Utils.cs b/Elwig/Helpers/Utils.cs
index a678b78..6d415a7 100644
--- a/Elwig/Helpers/Utils.cs
+++ b/Elwig/Helpers/Utils.cs
@@ -483,12 +483,20 @@ namespace Elwig.Helpers {
             return InternetGetConnectedState(out var _, 0);
         }
 
+        public static string ReplaceUmlaute(string s) {
+            return s
+                .Replace("ä", "ae").Replace("Ä", "Ae")
+                .Replace("ö", "oe").Replace("Ö", "Oe")
+                .Replace("ü", "ue").Replace("Ü", "Ue")
+                .Replace("ß", "ss").Replace("ẞ", "SS");
+        }
+
         public static HttpClient GetHttpClient(string? username = null, string? password = null, string? accept = null) {
             var client = new HttpClient() {
                 Timeout = TimeSpan.FromSeconds(5),
             };
             client.DefaultRequestHeaders.UserAgent.Clear();
-            client.DefaultRequestHeaders.UserAgent.ParseAdd($"Elwig/{App.Version} ({App.Client?.NameToken}, {App.BranchName}, {Environment.MachineName}, {Environment.OSVersion})");
+            client.DefaultRequestHeaders.UserAgent.ParseAdd($"Elwig/{App.Version} ({App.Client?.NameToken}, {ReplaceUmlaute(App.BranchName)}, {Environment.MachineName}, {Environment.OSVersion})");
             client.DefaultRequestHeaders.Accept.Clear();
             if (accept != null)
                 client.DefaultRequestHeaders.Accept.Add(new(accept));
@@ -497,18 +505,13 @@ namespace Elwig.Helpers {
             return client;
         }
 
-        public static async Task<(string Version, string Url, long Size)?> GetLatestInstallerUrl(string url) {
-            try {
-                using var client = GetHttpClient(accept: "application/json");
-                using var res = await client.GetAsync(url);
-                if (!res.IsSuccessStatusCode)
-                    return null;
-                var resJson = JsonNode.Parse(await res.Content.ReadAsStringAsync());
-                var data = resJson!["data"]!.AsArray()[^1]!;
-                return ((string)data["version"]!, (string)data["url"]!, (long)data["size"]!);
-            } catch {
-                return null;
-            }
+        public static async Task<(string Version, string Url, long Size)> GetLatestInstallerUrl(string url) {
+            using var client = GetHttpClient(accept: "application/json");
+            using var res = await client.GetAsync(url);
+            res.EnsureSuccessStatusCode();
+            var resJson = JsonNode.Parse(await res.Content.ReadAsStringAsync());
+            var data = resJson!["data"]!.AsArray()[^1]!;
+            return ((string)data["version"]!, (string)data["url"]!, (long)data["size"]!);
         }
 
         public static async Task UploadExportData(string zip, string url, string username, string password) {